I've been developing on the Mac since 1984, as well as being a Microsoft Gold Certified Partner. I let the Gold Certification lapse a couple of months ago only because I was not impressed with Vista. The good stuff had been pruned out of it. As for OS X, when it first came out, I just didn't like it. Too many security holes, too much was incomplete. I found that I needed to boot into Classic more than I used OS X.
I have several intel Macs, several PCs. My favorite flavor of Linux is SuSe, but SuSe is not ready for prime time in my opinion. Only now, when I use the iMac, have XP installed with OS X. I haven't had to touch Classic in a couple of years, I don't need XP any more. Its there, but after working on the Mac, XP and the Microsoft intrusiveness irritates me. I get more work done on the Mac.
Will it always be that way? I have no idea. Will I ever bother to buy a machine with Vista on it? Who knows. After looking at earlier betas, I don't have the need to even try. There is no new technological advancement in Vista that justifies its bloated foot print.
I really don't care about your resume, but since you are a developer you should know better base your opinions on a beta product. I have no "religious" preference. As I said before, I do have an iBook and my WordPress blog runs on Slackware. I am sick of uninformed opinion being passed off as fact. I am sick of FUD from people who don't even use Windows. And any time I see it, I'm going to refute it.