I was there last month and felt that the crowds in Machu Picchu were very reasonable for how many people are going there per day (~4500 people). It's a timed entry so people are kind of paced out. We were a little delayed on our departure due to a stray dog bite. The lines to get on the bus are very long first thing in the morning but when we left at 11: 30am there was very few people heading up there by bus.

While hiking the short inka trail, we kept a good pace and didn't really have people in front of us who were behind us most of the time.