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.
Over the shoulder supervision is more a need of the manager than the programming task.