lobster pots aren't really a problem if you keep your eyes open. I have been boating for 20 years in Maine and have snagged maybe 10. I am on the water 70-100 days a season. It also depends on when you come. Right now there are not many traps set around Mount Desert Island. Saturday the maximum trap density was about 50 yard spacing between traps. As the summer progresses the number of traps will increase, particularly in-shore. Some places are worse than others. Merchant Row north of Isle au Haut is notorious for having lots of traps.

As far as towing coverage goes, once you get past Penobscot bay there are zero towing companies. That said, you can almost always get help from a lobster fisher if you really need it, particularly if it is their trap you are fouled on. Keep a few hundreds handy to pay for a diver or to offer to a lobster fisher that helps you out (likely they won't take your money). In the worst case the coast guard will tow you in.

Lobster traps are actually useful too. They give you a an instant read on current direction and speed.

If you snag a trap line and have to cut it, try to tie it back together or tie an empty milk jug to it. That line may have a several hundred dollars of gear tied to it. I keep a couple of empty non-toxic antifreeze jugs on board just in case. I have never used one though.

Where you really have to watch out is in narrow channels with lots of current. In those locations the float may be towed under by the current and pretty nearly invisible. Also watch out in the later afternoon if you are running into the sun. Floats are tough to see when looking into the sun. A good thing to do if you are running into the sun is look aft. That will let you know how many floats there are. A glance aft wile running west in the afternoon can be quite sobering.

Basically, don't sweat the lobster gear. Thousands of boats cruise the Maine coast every year with few if any problems.

One final pieceof advice. Don't try to run on auto pilot.