I learned absolutely nothing from having to use horrid unix tools like gdb in college. The focus on unix tools, in my opinion, seriously degrades the ability of students to learn and unfortunately cements very very bad usability paradigms in their minds.

I learned a ton by debugging things on my Mac using Turbo Pascal, Think C, and even, when absolutely necessary, MacsBug. Those are all obsolete today, but it was well worth learning the skills regardless of the tool.

That said, we were also taught very little about debugging in class. I learned it all on my own (with help from friends). Most of my fellow graduates seriously didn't know how to set a breakpoint and step through code at the end of their college days.