I know fly but was sometimes it is nice to see the scenery even if it does take longer. I know not much scenery.
Mainly talking about Greyhound. Though if there is other better bus companies to travel on I am all ears.
In western Europe, my experience is that the state transport companies or good quality private companies (supplying transport by bus) are not, in general, creepy.
These days, the good ones are comfortable, safe, punctual, and reliable, and tend to have wifi on board.
I totally agree with that over there.
However, I cannot speak with any authority (or experience) on the situation re public transport, especially transport by bus, in the US.
In Europe, trains tend to be excellent, and buses - inter-city buses - pretty good, as I mentioned already, clean, comfortable, punctual, reliable, safe, and reasonably priced. Plus, these days, buses and trains usually have wifi, as well. Within cities, transport varies, but, in general, public transport is pretty good, and sometimes, it is excellent.
Elsewhere, things are different.