You really do come back with creativity from vacation. I should say that the only risk to the employer would be allowing you to take too long of a vacation and then you would realize how much your cubicle-driven McJob sucks and that you should improve widgets by doing X and then off you go to start a new company or work at a different place that doesn’t have the institutional barriers to implementing your Great New Idea.
Someone should do a study about that, the vacation as gateway to attrition.
Some friends and I once agreed that: Work sucks, but the drama is worth staying for. Preach.