We did that too.. It was the most crowded I've seen personally, but was totally managable, and with securing the day of FastPasses, we hardly waited in any long lines.
ITA. I just looked up the 6 hour wait days at FoP. We were there on 2/17 (one of the days). It was definitely busier than 2/13 but it didn’t feel packed (I guess everyone was in line for FoP!!)