I've been doing a lot of Pike travel lately for work (vs. virtually none before except occasional airport visits) and I've realized that the Boston Extension roadway itself is, in fact, one of the least congested in the Boston area. The reason for that is simple: the toll booths are far, far beyond capacity. Therefore it is physically impossible to get enough cars onto the roadway to cause excessive congestion.
Eliminate all tolls except for capital-intensive harbor tunnels and bridges. Raise the gas tax to compensate. There's no need for the civil-liberties-infringing, corruption-inducing, high-overhead, Rube Goldberg machine of tolling (open-road or otherwise). That opens up the Pike to federal aid as well.
The enforcement and collection mechanisms for any tolling scheme are simply going to have costs that outweigh the benefits, particularly with an alternative as attractive and simple as the gas tax (which involves collection costs of, what, 1 or 2 DOR auditors for the entire state?). My opinion has changed on this. I used to be a strong proponent of congestion pricing.
To go to Framingham from the Weston plaza right now it costs 30 cents. In an open road tolling world you'd get charged something like a dollar if you didn't have EZ Pass to cover the cost of mailing. No matter what, your movement is tracked by the government. Oh, and if you don't pay it soon enough, you get a penalty, and eventually a license suspension. This is the stuff that makes people lose faith in government. It doesn't matter that it's just a particular government agency that's the problem, or that in the real world it's often an individual's fault (for, say, not changing their address with the RMV after a move). For better or for worse, even a competently-run system is still dealing with human beings and human nature. And as a strong believer in an activist government in certain areas, I believe it's important to not have the government doing stuff that pisses people off at government.
Besides the simple efficiency argument versus the gas tax, and the issue of pissing people off, EZ Pass simply doesn't work all that well, and certainly isn't flawless. I get screwed on a semi-regular basis. Sometimes they fix it on their own, sometimes they don't. Looking at the last 4 months of toll transactions, I have several Weston and Allston barrier toll transactions where they V-Tolled me for $1.25 despite having my transponder and later caught their error, matching my plate against their database, and gave me a 25 cent adjustment. I have a couple Western Pike transactions where a 30 cent toll became $2.40 because they transpondered me at the onramp and v-tolled me at the offramp, or vice-versa. Am I going to call them for a $2.10 adjustment? Of course not - rationally, my time is worth more than the time it would take to call them. But lots of people would both call and get pissed off. And this isn't uncommon or simply an issue with my transponder, I know of other people with similar issues.
Over the summer I did a bunch of travel on the NH and Maine Turnpikes. On a few visits, and at a few toll plazas, their equipment didn't pick up my transponder. Months later I haven't received any violation notice. Having dealt with the RMV's DCU and the NH DMV, and having helped other motorists with these issues, I'm terrified that I'm going to be caught up in some bureaucratic snafu where with no notice my Reg and License will get nonrenewed or suspended and I'll have to navigate an interstate clusterfuck of government agencies.
It's just not worth it. The state portion of the gas tax in MA is ~23 cents. Make it an even 50 cents, index it to inflation, and then leave me the hell alone. I have enough to deal with in my life without worrying about toll violations.
Side note - let me renew my registration for as long as I want. I'll pre-pay for 6 years in exchange for avoiding the hassle of 3 separate renewals, even if it's full cash price and not Net Present Value. And get rid of inspection stickers, they're ugly and they're already linked to license plates anyway - Connecticut has done it.