I hate peeling squash because I of the slime that dries on your hands and takes forever to scrub off!!!
And I also find the Y shaped peelers the most efficient when I do do bother to peel them.
As others have said one of the easiest ways is to cut in half, remove seeds and roast and scoop out the cooked flesh. However, this won't suit all recipes.
But easiest of all is to not bother peeling at all, quite a few of the recipes I make with butternut I leave the skin on. I find it helps keep the shape of the cubes which can disintegrate, especially when cooking things like tagines.
If you are making a squash risotto it's a good idea to add the peelings to your stock to get an extra deep squash flavour.