Went opposite way as you, and would NEVER go back. NEVER NEVER NEVER!
A big company gives you rights that you can only dream of in a small/new one. For a time I was tempted by the posts you can obtain with seniority (like instructor, HR or else),and I got it, just to realise it was not worth what you had to pay back in terms of your time and peace of mind.
Only my humble experience...