Should preface this by saying it was my first Glastonbury, and the only festivals I've done before were either Latitudes 2009-12 as a kid and a few day festivals in London more recently. As such, I've got quite a limited frame of reference to work off.
I felt that all in all the crowd was largely lovely and kept themselves to themselves even during busier changes between sets. I was on stuff Friday and Saturday and did not feel intimidated by others in the crowd, nor did I feel like the festival was 'oversubscribed' or 'full of the wrong people' as some on here have suggested.
I would say that the movement between Arcadia and the Park on Friday night was noticeably bad. Having been caught up in that, I don't really know what to suggest, but it was a hairy moment and one I would not like to repeat again.
Beyond that, there were no other 'bad' crushes I experienced the whole festival. People's general sense to keep to the left meant that the two-way traffic was minimised, and it was a better time for this.
The phenomenon of large outer crowd smaller front crowd was noticeable, and I was often a beneficiary of this: both Haim and Diana Ross were better for having had (relatively) empty crowds at the front of the Pyramid Stage.
Ultimately, I think that the crowds do not deserve the navel gazing this thread has warranted. Yes, there were a couple of bizarre scheduling choices - such as Wet Leg on The Park at 2pm - but there were many good choices which helped to split the crowd up enough to avoid worse crushes.
Ideally, you would experience a festival free of any kind of difficulties, but I have enough realism to accept that is extremely unlikely. I enjoyed my first ever Glastonbury tremendously, and nothing I experienced would put me off again.