Yes, I'm guilty of that too. The main reason I don't take more courses is the time it takes to take them. I've taken 3 courses (databases, algorithms I & II), and they were all great, but required a lot of work. So while I'm tempted to sign up for more, I need to have the time available to take them too. This is similar to buying books, but not having the time to read them (something I'm guilty of as well ;-))

I wrote about the courses I took. Here's about the last one: http://henrikwarne.com/2013/02/18/coursera-algorithms-course...