BufferTabs, a jEdit plugin that lets you switch between buffers using tabs rather than the default dang-blasted pull-down menu. That pull-down menu has been my biggest complaint against jEdit. Being able to switch easily between files is a deal-breaker: it’s so important that I’ll stop using an editor if I can’t do it. Tiny frustrations add up.

Yes, I know I can use the keyboard. But when my hands aren’t on the keyboard, I really like tabs. And when I’ve got more than just a few files open, cycling through all the buffers to find the right one is annoying.