i must admitt we,ve done quite a few towpath rides and only had one or two incidents mainly with dog walkers and other cyclists who expect everyone to make way for them.
I agree early starts are the best especially on sundays when it can become busy.

Grrrr pet hate - cyclists who 'train' on towpaths - just slow down boardman its not a race lol
Dog walkers I don't mind, it would be easy to get annoyed but I normally just shout 'Out the way dopey' if a dog is being a bit dum, raises a smile and in the grand scheme of things I dont mind slowing for muttley and his pals.... That and the % of dog walkers who make the effort to control their dog is very high IME
What other canals have you done? I did the Leeds/Liverpool from Blackburn > Leeds which was very scenic in places and a good ride, I'd love to do the Huddersfield Narrow but cycling is barred on that one..... To the west there is the Lancaster Canal which I'd like to do as well - its an 'isolated' canal pretty much, there is the
Ribble Link but its still isolated IMO.