> Turn (almost) any command line program into a full GUI application with one line and lose the ability to pipe, check exit status, run from cron, run through ssh or a different machine, call from other scripts... The last couple of months as I know about more and more the command line, and can configure my shell and tools the way I like, I feel I'm more productive with the terminal than any other GUI application.
I've written more than a few GUIs that added up to wrappers around a command-line app, this would have been very handy then.