When I bought in the area, I was really concerned about traffic, but there is no way in hell that it takes 15 minutes to get from Bayview to Leslie. I drive regularly from where I live back to Scarborough to visit friends, and door to door, it takes 20 minutes. the route I take is going onto Sheppard Westbound, and then turning on Bayview southbound to get onto the 401. I have experienced that it is 20 minutes door to door on a regular day, 15 minutes on a good day, and 30 minutes on a bad day/during rush hour. I do this almost every day.
On a bad day/time, it may take 10 minutes to turn left from Sheppard Westbound onto Bayview Southbound. I have experienced this first hand. However, in most instances, it takes less than 5 minutes if even that.
As for Sheppard having bad traffic. Yes, I wouldn't deny that it does, at least westbound. But for most of the time, going eastbound is actually really good. Also, if your argument was that "the Sheppard subway was built because traffic on Sheppard is really bad", then what does that say about Yonge and Sheppard? It's at the junction of both of these subway lines.
Again, I understand and respect the fact that you adore Yonge/Sheppard and dislike Bayview/Sheppard, but I believe that both have its pros/cons and good qualities/deficiencies. I haven't done actual scientific research, but I suspect that the profiles and demographics of people living in these two neighbourhoods differ significantly, despite the fact that they are only one street away from each other. I expected differing opinions when I started this thread (and I welcome them too), but the least that I ask for is a civil discussion and not responses with condescending or demeaning language.