My Emacs: http://i.imgur.com/SNTZL6i.png
At first, Emacs font rendering felt weird to me, but some tweaking made it look slick. I use the ir-black theme with the Monaco for powerline font. Here's my config: https://github.com/mgill25/dotfiles/blob/master/emacs
Speedbar is good, because not only looks like NERDTree, it also displays summary of file contents (for programming: functions, classes, imports, etc.) if you want.