Though as per my point, maybe it's not just about super-specifically *kid*-oriented attractions. Like, when you speak of re going to Wonderland at 5 or 6, I could just as well speak of re going to *Yorkdale* at 5 or 6--and there was a symbiotic getting-there and once-there pleasure to *that*.
Remember: I'm not denying that the "entertainment value" was a big part of the Science Arcade's appeal (or that of the OSC in general)--and yes, it was part of that Sesame Street-era ethos of learning and being entertained at once. But just because it was *meant* to be an attraction in itself, didn't make it, or indeed the whole OSC complex, a vacuum. There was IMO an intuitive comprehension by even the youngest visitor of "something Moriyama-higher", much as there would have been of "something Zeidler-higher" re OP--maybe less so in the Science Arcade part (which, after all, was but a concrete warehouse), but certainly in the sequence of approach. Or, think of it as a micro-version of the "getting there is half the fun" principle--crossing the bridge, descending the escalator from the rotunda part, etc. It was the subtle secret to its success.
However, if you're to speak of Wonderland-type trips, rather than of, well, Yorkdale-type trips (or just everyday-shopping and similar accompanying-the-family trips), that might say something about my Neil Postman "amused to death" point; or how the common barometer for the experiences kids are party to became overly "ergonomic" by the 80s and 90s--like, enveloping them in a patronizing "kidspace" to a fault, almost by way of soothing them and inoculating them from the trauma of the Big Bad Boring Adult World. By comparison, the kids of the Rocky & Bullwinkle generation tended to have one fruitful foot in the grownup world. I did have kid stuff, but I was also party to family newspapers and other "grownup literature" (including maps, which helped my ability to "follow along" on trips). Heck, not only would I have memorized (like you) the route from Brampton to Wonderland by 5/6, through doing my map-reading-and-beyond homework I would have insisted upon taking different routes there by 9/10 and *not* insisted upon "the most direct way" (and knowing my mother, she probably would have sought out interesting Italian bakeries or whatever as an alibi--so, once again, it would have been a latently richer trip than one simply devoted to quick-there-and-back "amusing the kids").
It's like I said: it's not even just about the walk to High Park, but also about the walk *within* High Park--the play area, and the Zoo for that matter, as part of a bigger entity, of trails and paths to follow here, there, and everywhere: ones which might not be super-specific kid-oriented, but are kid-enriching all the same. But according to the "kidspace" mentality, that everything else is an afterthought.
And yes, I was the kind of 10 year old who could figure out a non-QEW way to and from Niagara Falls--but that's in part because we *did* go momentously off-QEW at least once and I "internalized it"; plus, there was still the carryover legacy of older highway maps that showed Hwy 8, and Hwy 2/Lakeshore remained a going concern until the Mike Harris era. (Of course, family experiences are important; and if the parents never took the off-QEW way to and from the Falls in the first place, of course the kids wouldn't internalize it. The most efficient way to "other" a route is to not take it, or to not imply that it even exists as an option--and paradoxically, such timidity's often born out of a reluctance to "upset the kids".)
And come to think of it, it's not like the QEW didn't hold its own youthful fascinations for me for all the weird archaic 1939isms that remained extant into later times--yes, somehow or another, I engaged (positively, transfixedly) to *that* element; like the highway version of weird 1967 psychedelia...