In my home there are 3 computers running pretty much 24/7 and 2 almost never need to reboot and all run Linux, Slackware to be exact. One is a Minecraft game server that only comes down for some updates but not all (it has lots of mods). The really old one is a firewall hub. My main used to be rebooted a lot just to toy with new things but admittedly I have only booted OS/2 once this month and it's use is dwindling with me since I'm too cheap to buy ECS, it's progeny. It does have both XP64 and Win7 on it but I haven't booted either in over 7 months though that could conceivably change drastically if and when Half Life 3 comes out. :S
That said I do boot variations of Windows for work but thankfully mostly BartPE and one of it's spinoffs that shall remain nameless here as per admin request.
Slackware is sufficiently still so much like BSD that I haven't booted any others in years. I just don't see any palpable advantage and enough disadvantage to make it an unworthy investment in time and effort and none of my business clients use it though many use Linux.
Since there are likely to be many gaming references in this thread I'd like to say that for those to whom gaming is Pop Culture, something that facilitates chat worthy experience with friends, I agree that it is unlikely that you can get by with Linux alone for very long. However if your gaming is just about the game that does not have to be true. For me, New ! == Improved. For me, it is all about the gameplay, the depth of involvement and variation in play as well as character development. Anyone who has played Minecraft for more than an hour surely knows that too by now since despite it's 90s graphics the game is just brilliant.
It really is not that hard for many people to be essentially fulltime Linux without having to accept any sacrifices.