ORIGINAL: Lava
Yep, know what you mean.
I didn't really realize just how much work I was getting myself into. Then of course, there you are, having spent an hour or so slaving on the darn thing and accidently hit the "fill" button and "boom" just like that the entire map is crise crossed with railroads! [X(] Having not saved most of the work, I then go into a rather unseemly fit of rage which leaves my whole family looking at me like a mad man. [:D]
Just keep it up. They'll get used to the behavior and won't look at you strangely anymore.
Anyway, I kind of developed a sixth sense. Whenever your input doesn't immediately take effect, it's probably because you accidentally hit the 'fill' button. Just stop.
Touch nothing. Freeze. Watch warily. Give it a good ten seconds before you let your guard down. Now when those awful railways go everywhere, you can hit 'undo.'
