I don't think I could ever switch to all Apple computers. I like the abundant software for the PC and the easier ability to build my own rather than overpaying in an Apple store for something I can pay a lot less to build on my own and put Vista/7 on.
And for the people hating on Vista/7...I really think people just don't know how to use computers, because my computer hasn't crashed once since Vista came out for anything other than stupid use...like when I was trying different core voltages overclocking my current machine. Of course, I don't visit stupid sites, I don't install bloatware on my PC, I keep it backed up, protected, defrag'd and never have any issues at all. And that's for both 32 and 64 bit versions. The only snag I had was when Vista x64 FIRST came out, I had a hard time with drivers, but that's a manufacturer issue not MS.
It works flawlessly for me.
Personally I like more control not less. Apple seems appealing to some because it does a lot of stuff for you and supposedly makes it easier. But I prefer to do it myself, even if it takes more time. I borrowed my SIL's Macbook when we were home for our wedding and just didn't really care for it.
LOVE my iPad though.