NO, DON'T DITCH THE LASER!!!
They are not more trouble than they are worth! Not by a long shot. They just need to be used in the right way!
They are a very convenient tool in the collimation process, as David mentioned.
Knowing this, and that a Cheshire will do it all, if you forget your laser, or found that its batteries are flat, you won't be crippled. And even if you forget your Cheshire, there are other "get out of jail" in-the-field tricks that will help at a pinch
Alex.