I have been a graphics designer on my own for now 5 years. I got here by way of using PC's and Corel. In the 10+ years of doing design and photo work, Corel has been by far, easier, more intuitive and faster to create/edit graphic design and images.
Now I'm using a program called Xara for most of my design, but go back to my old copy of Corel 7/Photopaint on a regular basis to clean up images and photos. Really the only time I go to Photoshop nowadays is to create transparent gifs (images that have no backgrounds), but that is really it. And, I have found that Xara and Corel actually do a lot that Photoshop won't and in real time with easier undos and modifications.
My biggest complaints for using Photoshop have been the many extra steps you have to go through to achieve the same effect, plus the incredible bloating Photoshop does to files that are often 98% smaller in Xara and Corel. As many of the printers that I have submitted designs to over the years have required mac driven eps, I have learned in both of my programs how to create files that can be transmitted via email - they're almost all mac users, but have seen the pdf light and some are converting. Most are quite amazed at the file size, without loss of composition or resolution.
I've kept on the PC path for several reasons. One, 100% of my client base is PC, and for them to be able to view files I create, it makes much more sense to be able to send them a PDF in a file size that won't choke the ISP line and take years to open or needing a special program to view proofs.
The other reasons are that I can go to the office supply store and try a new program any time I want, can get any kind of peripheral (printer, scanner, and Camera) from low end to high end and be assurred it will work with my system and not be proprietary.
I've been working my desktop for SEVEN years now. It has been upgraded here and there, but all in all, my HP has given me 7 very, very reliable, solid and enjoyable years...
So, PC can be a great thing even in my Mac driven industry. You just need to be willing, and look at the even bigger pictures - compatiblity, expansion, sharing with others and backing up files (Adobe PS pics 10 vs. Xara or Photopaint pics 1000).
The biggest caveat for most pc users, especially those who don't spend hours on their box is knowing all of the IMPORTANT sytems maintenance things - defrags, cleanups, firewalls, anti virus etc...these are very important and do require user intervention from time to time. But done and done before the blue screen of death, can help to have a smooth experience.
There is a need I find here to educate every computer user, Mac and PC, on all of the house cleaning to ensure a solid, steady experience. I am getting more and more clients who need to be shown how to accept firewall warnings, system and program updates, and set up virus programs. (I had one client who always got the updates, but never ran a scan - it was not pretty). Like your body, if you keep your bones healthy, get regular checkups, and eat well, you'll have a better body for a longer time.
Maybe this will help those of you on the fence, but I'm proof that if you want to be relevant to the majority, you have to be engaged in it too.