Yep, quite agree. I've never had a problem with speed on Vista, in fact I find it pretty quick once booted but I always use it on hi-spec machines. If anything I think it improves with age for the first month after install.
That said, on the same machine with equivalent tool set VS2008-sp1, office-sp2, solidworks2009, SQL-Ent 2008 full install, Adobe CS4 suite and quite a few other things, Win7 kicks Vista SP1 a** on responsiveness even when both installs are only a few days old. Raw processing power there is no difference, such as for video encodes.
I'm downloading Vista SP2 at the moment, be intreasting to see what difference that makes.