I always thought to some extent, that working at a large company (under very particular circumstances) could provide you with the resources and connections necessary to work on a side project/future startup at your leisure, without having to deal with the pressure of rapidly-draining funding or extraordinary levels of stress before you're ready.
Some big tech companies even provide support for people who want to do this (of course, under certain constraints, and to a certain extent).
Then again, if you're comfortable at a big company and working on something as a hobby or side project, the impetus to get it done and move quickly isn't there as well. Plus, a steady, large income produces a sort of complacency and tendency towards a more expensive lifestyle that would be hard to sustain once you leave again. So I guess it's a double-edged sword.
Also, if you do this, it has to be at a company where the environment and the work you do isn't toxic, but rather something you enjoy. While I was at another company doing work I really didn't like, I thought to myself that I'd compensate by working on a side project. I was only fooling myself, because when I got home I was so bored, tired, and frustrated that I had no energy to do anything technical. Different personality types might cope differently, though.