I used to be a console only gamer, and then I started playing Minecraft. A few months later I built a gaming PC, sold my Xbox and PS3 (kept the Wii) and never looked back. Best decision I ever made. I don't know how I lived without playing games like the Civilization series and Crysis, I really don't.
I was scared though, because I thought it would be too difficult and too expensive. The truth is, that the initial price is expensive and the initial effort to built and set up and test a PC is difficult and time-consuming. However, what you get out of the that is worth it, at least for me. While building a PC can be expensive, through Steam Sales and just the fruits of an all downloadable environment, the games are a ton cheaper. I have 100 games or so on Steam and it can't have cost me more then 250 bucks for the lot of them. I also had some difficulties initially with my PC, but when I booted up games like Crysis and Bad Company 2 for the first time I sat in awe and knew it was all worth it. The immense increase in graphical performance, framerate, resolution and control was amazing to me coming from consoles.
I went back to play something on my Xbox a few days later and couldn't do it. The drop off between the two platforms was just too big that I got annoyed and decided it was best to sell off my HD consoles and recoup some money from my PC purchase (as well as buy tons of Steam Games!). I guess I decided to keep my Wii because it is not aspiring to have great graphics and therefore I can enjoy the games on it with almost a retro feel. Plus most of the games Nintendo makes are masterpieces in my opinion and they have by far the best exclusives out of the three players.
I know this is kind of opposite of what the OP said, but I am seeing a lot of similar fears about PC gaming that I had a year or so back and wanted to talk about my experiences. I guess I also want to say that PC gaming is not for everyone, but it was perfect for me!