I've got the same habit with code, taking it offline with a pen in hand and stepping through it. Found it much more effective for working through logical issues in code because it strips all of the syntax checking, typing, temptation to execute out of the way and forces you to slowly evaluate the program flow.

With IDE's, Photoshop, Word, I think it's important to remember that they have activities and workload in themselves that isn't relevant to what you're trying to achieve. Separating this load out from the core task has some value.