Oh, that's interesting too.
My experience has been that experienced players can get through S1 without too many losses. Perhaps I DM it incorrectly, but my players have a habit (in heavily-trapped areas) of using summoned monsters, or the zombies of summoned monsters, or unseen servants or whatever, to open every door, walk down every corridor, explore every room and pick everything up... and learning what they face by watching to see how the summoned monsters die.
This tactic seemed infallibly successful in S1.
Equally, my experience has been that G3 is the most challenging module I've ever run. Groups that made it through S1 without seeming to have a difficult time get stomped in Snurre's throne room... the geography of the dungeon seems to mean that the fire giant reinforcements are able to cut off the players' escape route, and once the rakshasas arrive, it's basically all over. Again, perhaps I DM it incorrectly.