I'm not doing MWLP but doing the regular plan but I just wanted to say that I totally understand where you're coming from. I have also been losing very slowly, according to the scale.
However, like you, I'm also trying to focus on other things this time around and make this a permanent change and not just a "fly by night lose 60 pounds" thing. That approach has helped me a lot so far. I have been much more permanent with this way of eating and it has given me the tools to make healthy changes in my eating and behaviors which, to me, are much more important than the number of pounds I lose.
For example, I used to be a huge binge eater and that has curved a lot in the past few months since coming back to McDougall. Even though I've slipped a few times, the slips haven't been nearly as bad as in the past and I consider that progress. I have also made other good changes, such as automatically saying "no" to temptations my parents put in front of me, like going out to dinner or lunch or for an ice cream or (just this morning) joining them in a very fatty brunch. I have also stuck with being vegan and as low fat as I possibly can when I do have to eat out. These are things I never did in the past even when I was trying to be on a healthy plan - temptations like restaurants were "throw in the towel" times for me.
I'm finding that if I focus on sticking with the plan and making healthy changes, I will continue to lose weight, even if the scale doesn't show it. My clothes are definitely fitting much loser and I can put on my bracelets and ring in the morning pretty easily whereas in the past, my fingers and arms would usually be to bloated for me and I'd have to wait a few hours before I could put them on. I'm also noticing health changes - less migraine headaches, more energy, more clear focus.
Another thing that has helped me is to also take measurements. I find that even if the scale says I didn't lose anything, the tape measure often times says something different.
I would also say, don't get discouraged! I think keeping consistent is the key. If the weight doesn't come off in a week, it will come off sooner or later. I don't believe you can eat this way and not lose weight in the end, even if it takes a while