This is a complex topic, but.. I don’t think there is a single park in Toronto that is so crowded as to “impair enjoyment.” Certainly not the ones in this area.
There are definitely parks that don't have available seating at times of peak demand in summer. Village of Yorkville Park can get very full.
Victoria Memorial Square is another one where I've seen every bench or table filled.
I can't speak to that issue in the St. Clair/Vaughan area as I'm not up there enough to provide an informed assessment.
At P&R it does not seem to compute that people go to small parks because they want to see other people, not avoid them.
I don't think they really do an assessment of crowding, any more than they address wait lists, they just go by formulas and nagging from Councillors offices and maybe an Official Plan or Strategy....sometimes....(ie. TO Core)
The problem as I see it, is that the formula should be a broad strokes guideline that says 'we should have a look at this', or 'this is likely a low priority', then Parks should actually do the drill down, as well as apply some common sense.
As example on the latter, portions of East York show as being very high in park space, because of adjacent valley lands in the Don or Taylor-Massey Creek.
But those parks aside from being mostly at the extreme west or north of the area in question, are relatively difficult to access. Steep hills pose an issue year-round, but there aren't even entrances/paths/stairs all that frequently, and of course, the 'natural' parks don't provide sports fields or a variety of other uses the community may need.
Meanwhile, some other areas may show as low in parks, because of high density, but no one has actually ground-truthed the extent of any issues.
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I will say, not everyone wants parks as social spaces, that's absolutely the right answer for some, just as sports fields or tennis courts or botanical gardens are for others. But there are people who seek refuge from the noise and bustle of the city in Parks too. (along with wildlife viewing, etc.)
All these different needs can be met.
The problem with Parks, it tends to please just about no one. Executing almost every idea poorly.