Congratulations & welcome to GWX!
There will be no going back to stock now. I have dial up access to & was blown away by the sheer depth of the mod after someone was kind enough to mail it to me. It's been almost a year since I got 2.1 (I have 3.0 now) & I'm sure that there is tons of stuff that I have yet to see.
PS. That stuff wasn't included in the stock game because the developers were forced to get the game out ASAP (as usual)...