In Classic if you were logged in and went to settings there was a Labs tab with a bunch of extra doodads you could enable. Measuring tool, the ability to do the shortened URL link-out, latitude/longitude mouse-over tooltips, "What's Around Here?" maps view (dotted the most oft-searched commercial addresses on the screen), drag-and-zoom tool, smart zoom (auto-zoom to the most detailed view that has available imagery), and had skeletal amounts of aerial imagery to enable before Satellite view got its 45-degree angle mode. And it was all right there no more than 1 click away onscreen, unlike now where everything's nested or takes more clicks to execute.
Most of it's been folded into the new Maps and some went obsolete when new features were added to Classic, but it's infuriating that the reinvent-the-wheel crap like the measuring tool perform so much worse in the new version than what they've had for damn near 5 years in Classic Labs. With such inferior UX design. For example, having a different shaped/colored starting target on the measurement tool from the ending target, and a separate counter for the actual distance count that stayed on the same part of the screen the whole time, had one-click switch from English to metric units right next to the counter, and didn't require squinting at the measure line at a tilted-angle readout to get the counts. The same functionality is there today, but those are UX regressions because they re-coded from scratch what didn't need to be done from scratch and left a bunch of those finer touches out. If you have to squint to get a readout or tell the starting target apart from the ending target--where you never did before on the old measuring tool--that's a usability regression.
Amateur hour. Not as amateurish as the bugs still lingering after a full year of debugging, but amateurish all the same.