People keep saying this, but this year's pre-SOAP fill rate for programs was higher than 2020, and the positions offered in SOAP was lower. There is absolutely no evidence for "interview hogging" or anything like that. Programs were also able to interview more applicants - some by a lot - so from a program perspective this match was a smashing success.
There are always a lot of SOAP applicants. Keep in mind the SOAP is dominated - like, 75%+ of applicants - by re-applicants and FMGs.
The main difference is that programs that have a "good location" weren't able to show it off as well, so I would anticipate in-person second looks becoming more common. But we had a number of applicants who came in for "informal" second looks (e.g. didn't come on campus but just toured around the city on their own, asked us for places to check out, etc). I think students will still visit cities of their top few choices in person.