I am a St. Louisan who found this site through Googling on my new MyTouch phone to find the UrbanSTL forums.
I think some of what has been said is a little misguided.
St. Louis is not as urban as Boston, yet both cities are the densest portions of their large and primarily suburban regions.
Second, if you need convincing that St. Louis is urban and has significant architectural merit, please visit one of several threads on Skyscraper Page. Here's an example.
http://forum.skyscraperpage.com/showthread.php?t=170320.
Third, UrbanSTL is a large forum because St. Louis is witnessing a tremendous revitalization. The city's decline is famous (4th largest American city in 1900; 850,000 people at peak population in 1950 with around 355,000 today in 61 square miles). Yet the city's remarkable turnaround just isn't garnering as much press. All over the city, neighborhoods are seeing derelict structures put back into productive use. A once utterly dreary downtown is adding amenities by the day.
I'd be lying to you if I said St. Louis could play with the big boys in terms of art, fashion, and anything avant-garde, but if you want great food, nightlife, and sports on the cheap, it is quite the draw. For a city its size, it's packed with things to do. Most of its events and attractions are affordable as a bonus, if not free outright.
I can go into more detail for anyone interested.
Kennedy--
Where in St. Louis did you move? If you need assistance discovering Urban St. Louis, let me know. You're right that "West County" (not at all part of the city) is simply not urban and that many County residents refer to all of the city as "downtown".