I just went to Zion last week. There was an hour long wait to get on the shuttles due to crowds. The River Walk trail to the Narrows was so congested you would bump into people. The Emerald pools was packed with people despite being a 500’ climb. It’s a very popular park during spring break.

I visited Zion a fair bit when I had pretty regular business travel to Vegas. Probably wouldn't go back today. The shuttle is something of a nightmare if you don't pay to stay in the park and I think my favorite hike is still closed due to rockfall.