My favorite features (that I've only seen implemented half as well in every other editor) is the pop-up Go To File dialog where I can start typing a file's name

My favorite features (that I've only seen implemented half as well in every other editor) is the pop-up Go To File dialog where I can start typing a file's name and it'll find the file in the open project, and the Go To Symbol dialog where I can start typing a function's name and it'll go right there in the current file. The best part about the Go To File dialog is I can type something like "mess re pht" and it will find "message_report.phtml". The filtering is instant. Whenever I go to a fellow engineer's desk to work with them on something and they're using Zend Studio or vim it's so painful to watch them go through a gigantic project tree to find a file when I can open any file in under a second. The full project search is fantastic, too. Once it's indexed, a full project search of a 500KLOC project takes only a few seconds.