So far I'm in the same boat the TRSmith & bondo, I don't really care which OS people us as long as it is productive for them, but I just haven't found any one that works better or worse than any other.
I don't type quicker on any given OS
Sure, I know keyboard short cuts that speed things up, but that's just like saying it take more time to change lenses on one camera vs. another.
When I launch an app all the OS' - say a word processor - they all seem to come up in about the same. (e.g. Photoshop boots slow reguardless of the system)
Browsing the internet
Give the selection of browsers, these seems to be more about the connection speed than the OS. IE on the Mac is gone, Safari on the PC is a dud thus far, Firefox/Opera seem fine reguardless of the plateform...
For my use, seems to be equal all the various OS with the noteable expection of games. Apple seems focused on bringing gaming to the platform so that might end up moot too.
Seems to happens everywhere be it in apps or OS' and frequence is a function of penitration application/OS.
Last year's hardware with next year's OS
Perhiperal makes all seem to find keeping up-to-date with driver support for new OS' a chore and put it off.
I don't know an OS that is easy to do large scale deployments, but granted i haven't done deployments since NeXTStep was the new up and commer and the Mac SE 30 was getting a little long in the tooth.
Is it all really more about personal preference, or are there really differences?