Lots of those are very slow, single chargers that do not always work. Say each car is going to take 2 hours to charge, if your third in the queue you’ll be there for 6 hours. That’s not going to be a very enjoyable trip.
So, the highland council chargers are limited to 45 minutes charge time. That does mean that nobody gets a full charge, which is pants. But does mean there aren't massive issues with queuing.
We managed with the public chargers when we went up there for our first trip. There were a few enforced lunch breaks (Most the chargers have picnic benches nearby, we have a camp stove and had tea). The chargers are old, and not massively reliable. On the other hand, if you're not going to get more than a 50% topup in the 45 minutes and they're only 50kw*, you can stop early without speed penalty.
On our second trip, we booked accommodation with EV chargers, which made life a lot easier
General comment, the roads are much slower up there, and your battery goes quite far.
*Typically between 34kw and 50kw in practice.
3 pin charging is universally available
On the first trip
1) Airbnb advertised with charger, charger worked correctly (Car delivered early, and we had booked most of the accommodation before we decided we'd EV it)
2) Happy to provide 3pin
3) Car parking 40m away from a power socket, electrics new but a feed from the main house. Slightly chaotic artistic owner who had painted the consumer unit so a reset of a breaker would cause cosmetic damage.
4) Car parking 30m away from power socket
5) Utter refusal - a previous person with an EV had plugged in without asking, didn't pay for the electric and popped the breaker to the hut by leaving the EV charging while they did their cooking. Owner didn't know where the breaker was and had to call an electrician
6) Initial discussion, but refusal because the owner "Would have to put her direct debit up"
7) Arrived late and couldn't be arsed with the discussion, there was a supercharger nearby
On the second trip, we got accommodation with chargers or at least near a cluster of public chargers, and had zero problems
Even if they are 50kW, that doesn't mean that you have to fill up on them, just add enough to get you back out to faster ones.
And if the lines were so long, there would be a LOT MORE of them.
It's hard to make a judgement around an areas provision just by looking at an EV charging map and thinking "Should be doable". There aren't any >50kw chargers in the highlands (Except a small 75kw install at John O'Groats), so it's not really a case of limping to the nearest fast charger. On my first trip we didn't see a charger faster than 50kw for 8 days.
Charging in Scotland was Scottish government funded at one point, and it was great 5 years ago. But there isn't funding for further expansion, and the pricing for the government funded chargers has made it unattractive for commercial competition.