As a lot of people have said, there could be a lot of reasons for this:
-Holidays and trips are often booked for and budgeted in advance, so we won't see the full impact until next summer.
-People are cutting back by having UK holidays or day trips, rather than, say, 2 weeks abroad.
-People have saved money due to not going away for the past 2 years etc, so can afford a bit extra this summer.
-People are choosing to holiday in the UK this year for various reasons.
-The big price rises haven't hit a lot of people yet, so they are enjoying things whilst they can.
-Due to covid, people feel more of a pressure to get out and do things whilst they are available.
It sounds mad, but some people genuinely aren't aware of the cost of living increases, or don't think they'll be as bad as projected because the government can't possibly allow it to happen. And so, at the moment they may feel comfortably off and want to enjoy it.
I don't think we'll start to see the real impact until December/January time at the earliest. I also think that, unfortunately, some businesses will struggle to survive, and then you'll get people hit by redundancies etc.
I'm also not convinced places are as busy as they were in 2019- I think they may feel busy because we're used to 2020/21 levels. I live in a tourist area and went out on Friday- I was expecting places to be rammed. It was busy, but not completely packed, I'd say quieter than 2019 levels BUT busier than the last two years.