I've programmed for 6 years, and in that time, I've never used a PHP IDE. I feel perfectly fine using VIM, linux shell, mysql command line and subversion command line for my web application development. When I'm asked to work on other people's projects, or open source projects, I can generally find my way around after a quick system architecture overview.
Recently, I was curious about PHP IDEs. I downloaded NetBeans, but lost patience debugging installation problems.
It makes me wonder, will my productivity increase substantially with the use of a good PHP IDE? What percentage of LAMP/PHP developers use a PHP IDE?