I have this problem to an even worse degree at times. Wherein I can't get into teamfights that re happening in the jungle or in another lane while cutting through jungle because auto-pathing backs me up and puts me on the longest route.
And by longest route, I don't mean always the longest possible route, since it is slightly smarter than that (sometimes); but it tries to go around terrain which takes a good few minutes off, when I'm already so close to river, which is a clear shot to any lane (poor example, but I'm thinking just off the top of my head, forgive me). I can lose minutes that I should've spent in said teamfights with it's frequent failing me within a single match it feels now and then.
Sure, I realize cutting through jungle to get to teamfights can be dumb and risky if not done properly, or if there's no vision. But it tends to be the only option sometimes. Like when you're team is pushed out a tad far, which, yes, we should've be so far out of position in those circumstances, but with decent team-mechanics it can pay off. But decent team mechancics requires as full a presence of the whole team during at teamfight. Autopathing tends to stab me in the back in those sorts of situations more often than being useful or profitable for my team and I -- when I can't actually get anywhere because of it.
I guess my point is that I'd support drawing your own path to an extent, but on a whole other level I'd like the option to turn off the AI "autopathing" altogether, aside from maybe a straight line into lane. "Lane-pathing", so to speak.
I know there are plenty who'd probably disagree with me, but I just hope we can get this discussion running and have the developers eye on these sorts of issues for the near-ish future in terms of working to maybe improve upon it in whichever way be possible within the coding. I know some may say "just don't rely on it", which I've tried not to use it at all, and yet it still crops up and rears it's ugly pacing head from time to time for me, -- when I'm clicking the actual map and not the radar.
Also, apologies about the novel-length of this post.