One point I was trying to make was that an important number of OAD&D and OD&D modules were not -- by any reasonable definition -- simple 'dungeon crawls'.
My favourite series -- UK 2-4 -- is not a dungeon crawl. (And neither are the other modules in the UK series, e.g. UK 1).
L2, the "Assassin's Knot", is another one of my favourite OAD&D modules -- and it is not a 'dungeon crawl'. Heck, it is straight-up murder mystery. Try playing L2 without role-playing, and you will get no where.
I could go on, but my point is that there are some OD&D and OAD&D modules that are very plot-focused (albeit without the railroading found in the DL series and 2e modules).
As for the others (the G1-3 type series), while they can be played as simple dungeon crawls, the minimalism of those modules does not prevent the DM from running them in a very different way.