Preston, you should be thrilled! :)
Consider Linux as the best of the old and the new - both which are familiar territory for you.
NEW: the snazzy graphical desktop and competent replacements for commercial apps.
OLD: the pre-Win3.1 days of powerful command line tools. Sure your commands are different, but if you suffered through it back then, you'll probably actually enjoy it now.
Either way - welcome aboard!
We're debating the merits of grpahical vs command line at: http://www.oreillynet.com/pub/wlg/5170