I was just reading the Pennsylvania FAQ page and it seems Governor Wolf did a better job on his order than either Governor Murphy or Governor Cuomo. In my opinion that is because of the education he received at The Hill School. He did exclude those who work in Pennsylvania but live in a neighboring state. He did not exclude anyone not working, or on critical business, but I know those vacationing from NY or NJ is not enforced.
I seriously doubt Wolf is any more or less educated than Murphy or Cuomo - all very accomplished, successful, intelligent people with distinctly different personalities of varying levels on the obnoxious scale. So, leaving that aside . . .
It may not be the answer you like, but the reality is that our states have a compact that allows for travel to bordering states for purely practical reasons. As conditions have worsened, they have emphasized that travel should be for essential reasons only (work, healthcare, interstate commerce), etc. I can't speak for PA or NY, but NJ is discouraging *all travel* beyond a bordering state for any reason whatsoever.
However, with hotels, businesses, and other venues open, it's not practical to enforce, so yeah, it happens.
I can say that most spread in NJ is due to private indoor gatherings where masking and distancing aren't happening. NJ is also the most densely populated state in the country. If you look at our numbers, the more rural counties are better than the more urban counties. My county, a suburban county, has a lot of shore activity and people with attitude so yeah, rules aren't being followed with regard to gatherings.
At the same time, the police aren't going to knock on doors and peer in windows. It is what it is. Spread is directly tied to personal behavior regardless of rules. For the most part, where masking and distancing are being followed, issues aren't happening.
I would suspect county numbers in Florida with similar circumstances (dense populations, disregard for masking and distancing) are seeing similar numbers. Statewide, there's a lot fo rural area, too, to balance that out. I would say if Florida's number/100,000 is even close to NJ, it speaks to how bad it is in Florida's urban areas.