In the past two years, I’ve had to learn how to install Apache, PHP, and MySQL on a Windows machine, a process I was able to leave to another department in the past. I had to learn how to deal with my.ini files, php.ini files, httpd.conf files, moving the htdocs folders, move MySQL’s data folder, etc. And every time, every time I thought I had the process down, the next time I touched a box, guaranteed I ran into a problem that had me fiddling with settings for over an hour or two.
Maybe it was just me. :) Needless to say, I was sick and tired of wrestling with it. When a new project came up that required I relearn the whole installation over to accommodate PHP5 and MySQL5, it nearly broke me... but luckily WAMP5 was there to save me!