It's pretty crowded starting Saturday of President's Day weekend, but beginning tomorrow crowds will ease a bit more each day through the end of the week.
We were there last week. Things were crazy on Saturday and lots of people I talked to were just arriving. My DH said that he hadn't realized how spoiled we were last week. We walked on rides and some we got off and right back on. Waits are longer but use those FPs. You will have a great time -- remember a crowded day at Disney is better than a day at work anytime!