Nobody does. I'd say the safest bet right now would be hitting Roadhog hooks
As a tracer player, I can confirm that roadhog hooks are my #1 downfall, with junkrat traps being a close 2nd. If there is a really skilled junkrat on the opposing team I think he's probably a much larger threat than a roadhog could ever be, but it is far easier asroadhog to hook someone than play a really smart junkrat, imo. I played one game where I got stuck in his trap probably two thirds of the time I died... he placed them really well and when I managed to dodge his trap he did a good job covering the entire floor with grenades making it impossible for me to approach, even with teleports. You may assume that the bear traps are really easy to avoid, but when you're going sanic speed all the time, they are insanely easy to miss. Roadhog hooks on the other hand are just downright annoying how easily they can get a tracer... if I teleport as soon as he throws the hook it still hits me since it is somewhat-homing. The only plus is that there are surprisingly some awfully shitty roadhogs that will miss a direct hit on me after I've been hooked and only hit me with some of their spray, leaving me with maybe 5 health but still very much alive, at which point I can rewind time and fully heal. This happens less and less of course, but it's nice when it does.
On a side note, any tips for attacking on payload maps? Even when I've got a team of maybe 3 guys we seem to absolutely suck at attacking on payload. All it takes to beat us is the opposing team to dig in at a great chokepoint and have bastions and/or torbjorn turrets up on a rooftop somewhere, with a reinhardt and support class to back them up. I don't know what it was, but last night it seemed like every single time we were on attack the other team absolutely crushed us, even if we were going even with them if not destroying them in earlier rounds. When they'd attack on payload we'd normally at the very least go even, and we'd usually do pretty well even if we did lose. But on attacking... nothing seemed to ever work. Suggestions for team comp and strats? I've seen reinhardts and bastions just sitting on the payload and turning it into a tank when on offense, I've yet to try that but I try to stay away from bastion as much as possible, however effective he might be.