It's weird. I used to love Ubuntu, but after 8.04 I just stopped liking it. The little things niggled away at me. The bloat, the fear of upgrades breaking things (this is why my main home file server still runs 8.04, something I'm not happy about) if you have a slightly nonstandard install. I switched to Arch for my main home laptop and breathed new life into a PIII-850 with 128mb of RAM. Ubuntu would've killed it.
In a bizarre twist of fate, work requirements meant having to use Windows Vista (the horror!) then 7, where so far the best feature seems to be "It's not vista", so no more Ubuntu at work for me, except through VMs.
Still, Ubuntu did a heck of a lot to make Linux easier for the masses, and I have to say thanks to all those at Canonical and the Ubuntu community that made it possible.