I have always cooked my lasagna sheets first because I've been making lasagna since before the no boil type were available. And I still do--boil. I plan to make some fresh pasta and I won't pre-boil that perhaps. I have found that the method I read somewhere and incorporated into my recipe to boil and then lay out on towels has made assembly of the final casserole ever so much easier.
And I have read from knowledgeable sources (chef instructor, cookbook author) that regular lasagna noodles can be used uncooked if the lasagna sauce is sufficiently liquid. AND also the trick of just covering with the boiling water that ______ mentioned.
Look at all those veggies.
Get my girlfriend to eat that!
Where's the meat!?
My husband, the dedicated carnivore, thinks my veggie lasagna is really good--you'll NEVER miss the meat!!