I would love for someone to pay me to write an IDE. I've been in that situation a couple of times in the past (SQLWindows, Visual Basic) and it was a lot of fun.
However, my current job is developing a voice response system for restaurant drive-thrus. I don't have time to write my own IDE right now!
So I farm that out to JetBrains and get to use all of their awesome work for less than fifty cents a day.
If that's too much, their free versions are very good too.
I may also take exception to this:
> A doctor tries to avoid general checkups with other doctors.
Wouldn't the opposite be true? As far as I know, every psychiatrist has a psychiatrist, every counselor has a counselor (or should), and I would guess that every doctor has a doctor.
A doctor is more likely than the rest of us to have particular insight into their own health, but I don't think they try to do it all alone.
Of course I'm only speaking for myself. If anyone prefers to write all their own tools, more power to them!