I'm four weeks into my new job. I'm happier than I've ever been. Certainly, not having dickheads as coworkers is a grand improvement.
Everyone else at the workplace is happy too - and there is an incredibly broad demographic.
I hope it will be my last job.
It makes a big difference. It also depends on the type of dickhead. Some people are dickheads at work because that is what they think gets the work done. Some are dickheads because they don't actually want to do the work, so make unnecessary complication.
Careful what you wish for! :D