I don't really like anything Joss Whedon has had significant creative input into. You're not the only one.
I know this is PHP, so it might be expecting too much, but what ever happened to using vi?
I'm a semi-pro (all told I've probably made nearly $100k) web developer and I've never felt the need for all these fancy IDEs. I've tried them before and they just slow me down.
The explanation requiring the fewest assumptions is the most likely to be correct. -- William of Occam