Goto Definition is an excellent addition in Sublime Text 3, but when I use it I find I end up with tons of tabs open from using Goto Definition to quickly peek at a method definition, and then using Jump Back to return to where I was working.
Sublime Text’s sidebar offers a ‘Click to Preview’ facility, where clicking a file once in the sidebar opens the file in a preview tab, that closes again when you switch away from it. A preview tab is converted transparently to a full-fledged buffer if you make a change to its contents.
If Goto Definition supported the same functionality, I’d use it; that way only definitions that you opened and then actually made changes to would remain open.