OK - I might not get to 10 - but I've had to drive way more than I like in the last year due to where work has taken me.
1. Keele & St. Clair
This intersection is always backed up for about 10 minutes as there is a severe bottleneck in the railway underpass just to the East. I've had to come this way from the far end of Mississauga when visiting my sister on the way home. There's quite a bit of commercial traffic + many contractors toing and froing between Home Depot and work sites in the St. Clair W neighbourhoods.
G+d only knows how much worse this will be when the streetcar right-of-way is complete.
2. Victoria Park and the 401
I come down here on the way home from one of my York Region clients if the DVP is reported in bad shape. Although this wasn't so bad earlier this week, I've seen the whole area gridlocked in the evening. This is probably true of number of intersections with the 401.
Teh highway is too big for the exit/entrance infrastructure. It would have been better to have two expressways instead of the monster that's grown up. This would have allowed for more manageable traffic flow.
Over the last year I made many trips out to Hamilton for work. The ride home always hit a big slow down (i.e. E-bound) just where the 427 merges in. Despite the extra ramp that was built a few years ago from the 427 collectors, this gets backed up by about 5:00 pm. This is one ramp that could benefit from metering.
4. Gardiner East curves
There are two curves on the E-bound gardiner where the maniacial speeding hot heads in the left lane always end up rear-ending slower moving traffic. Once is just around the Humber - and the other is at Dufferin. At least once a week some jackass would have got himself in a fender bender (or worse) and ruined the journey home for thousands of commuters.
OK - I've got up to four. If you think I'm going to write about my top ten shortcuts - keep dreamin'.