Fascinating thread!
Speaking as someone originally from London, Ont. - only a couple hours away - I could always detect a distinctly different accent from GTA natives. As has been mentioned earlier, since so many people in Toronto are not originally from Toronto it is hard to detect any distinct accent just from listening to random people on the street. But among people born and raised here there is certainly a different voice (or voices depending on cultural/ethnic background), though perhaps not unique ones.
Speaking specifically of the stereotypical "Gino from Woodbridge" type accent (heard mostly among white folks of often, but not exclusively, Mediterranean-ish extraction), I also notice a very similar accent, to my ears anyway, among many Anglo-Montrealers. I'm wondering if this is an influence of the large anglo exodus from that area, or if it arose here independently?
Someone asked earlier to provide examples of. One for me would deffinitley be Al Waxman (Polish-Jewish Toronto native) from King of Kensington. Although at times he could lay it on a little thick (acting?) In this clip it seems at times to border more on and American eastern seaboard kind of thing:
[video=youtube;CfJec3aY2Mo]http://www.youtube.com/watch?v=CfJec3aY2Mo[/video]
At any rate, nobody I grew up with in London ever sounded anything like that. But I hear it - or variations of it - around Toronto all the time.
To a lesser extent another example would be that Mike Holmes guy. Not sure of his specific background, but he seems pretty blonde-hair/blue-eye, Anglo-Anglo. But of course, being a contractor, I'm sure he could have picked it up, if he didn't have it already. I once worked with a Portugese-Torontonian and, after a while, found myself often talking like him!
After 10 years I still feel like sort of an accent-outsider here, but I recently heard myself on radio and thought I was starting to sound quite Torontonian. But, to a native, I probably still sound like a southwestern Ontarian - or some weird hybrid.
One last thing on the California similarity thing: is it just me or was Bob & Doug McKenzie using "like" as a hedge-word quite a bit - even before Zappa's Valley Girl or Fast Times at Ridgemont High, etc. was popularizing it around North America in the early 80s? Or was "Like" in fairly common at that time already? I was only born in 1980 so I can't speak to how people were speaking before then.