I've had two microdiscectomies, for a severely herniated disc, of my L5-S1. The first was in April of 2010...we were able to go to Disney the following October and I rode everything. The disc reherniated in 2014 and I had surgery again. I went to Disney 11 months later and rode everything.
I now have permanent numbness in my lower right leg due to the nerve damage the herniated disc caused. We're going to Disney next weekend and I will ride everything. I have my anti-inflammatories with me in case things flare up.
The things that are the trickiest are drops...Pirates, Splash etc. It's the jar at the bottom of the drop. As long as I brace properly I'm okay.