I'm a diehard fan of Notepad (not the ++). It's where I first learned to program, and I stand by it. If the collapse features in Notepad++ were a little cleaner, I may reconsider, but for now, keep it simple.
My only complaint about Notepad is the color scheme. I have a sensitivity to light *hisses at the brightness*, but I may have to check out that SubLimeText, just for the darker scheme.