Personally, I don't think it's just about length, it's about pure quality and how drawn you are in to a story or background. If it's well done, it can be like Hex, where each showroom is a key part of the ride that offers a different, high quality experience, and it's not all ride centric, assuming the AV effects are doing their job. Having a set of 'shows' where the ride is part of the finale can really work.
Another thing I think to go for is creating sense of being in another environment, and doing this through having different rooms with different sizes and heights/levels. It's one thing I love about the Kingmaker exhibition at Warwick, you aren't just walking through what feels like the same room or just passing through doors, you wander through corridors, go up and down stone staircases, and pass through dimly lit chambers between each scene of battle preparation.
I think Wickerman's queue should of followed this kind of approach and been a journey through the forest and village leading up to the actual sacrifice. Not anything that takes too much of your attention or gives too much of a story, just background stuff. Ceremonial rituals, walking underneath tree roots, going through village houses, village elders reading stories, passing through a wolf pen or menagerie, that kind of stuff. I think the projection part could still fit in to that too, in fact it would probably enhance it.
None of these suggestions are little changes though, so I'll answer the question honestly! Pretty much everyone has given good suggestions already but the key things to go for are reversing every cut imposed since 2015. Duel's situation with the awful use of blacklight/fluorescence needs to change ASAP. And, yes an end to Fast track. And yes, I agree with Alsty, more beer is always good!
