I think Facebook's new features are good. They made me realize how much of my old crap (status updates, comments, etc) Facebook has stored. So I deleted everything older than one month, using the new Activity Log view and some Selenium scripts.
I'm sure you didn't delete those. You only hid them from the timeline. There's a huge difference.
I have hid many the old stuff too, but sometimes, especially with timeline transition, few old items kept popping up and wouldn't hide until fifth or so times clicking the hide button.
I did the same thing. Delete everything. Although, some actions you can only "hide", like comments on other people's walls and such. At least that's my understanding.
