Get real. IE is must have if you're a web developer. Last time I checked, IE was still over 50% of the web. Web developers still need to check their website in a bunch of browsers--including multiple versions of IE since a lot of users are stuck on IE 7 and 8 for whatever reason.
I'm not a web developer. Nor do I use Windows at home. I guess your point is that in the enterprise or web developer industry, you need Windows PC, I can totally believe that. Also, if you are an aggressive gamer, you will probably be more happy with a PC than a Mac. If you are outside of those areas, you'll probably be happy with a Mac or whatever else you want to use. If you are a consumer/non-gamer, then it doesn't really matter unless you are into Office; I mean, the must have apps are already on the web (facebook).
There were several programs in my college classes (enterprise bullshit) that I needed IE to run. I didn't say it was a good thing, but that is the way it was.
You are correct about enterprise apps and (many) games. If you are a big gamer, there is not much point to get a mac.