When boating where though?
I’m on the GU between Berkhamsted and Birmingham every month, often more frequently, and I haven’t noticed any significant changes in the numbers of wide beams of the move. In a routine day I’d expect to encounter 0 or 1, with 0 being more likely than 1.
I don’t doubt some people do get inconvenienced by them. I’ve had minor delays further south where they are more prevalent; a certain amount of which is because those on the move often seem under-crewed.
It made me wonder if your experience was skewed by towpath observations around London.