With the exception of The Sancturary it sounds like this years Scarefest is a bit hap hazard. Thinking back to previous ones, best ones which stood out for me were:
ToTT - the year whhen the cannibals roamed the house (2007??) and as you went through the house you realised you were the dinner. Being cooked in the oven only to reach the finale of them all sat around the huge dining table eating, being counted down to leg it and running like hell out of the door in a panic being chased by the Master with a huge knife!!!
Field of 1000 Screams - definately the best year was with the Bus Scene at the end, walking around this field, feet and back killing, at 11pm in the dark was so atmospheric!! Getting into the bus, lights go out, smoke and strobes inside then you see someone crawling up the floor of the bus towards you, brilliant!
Duel Live (2nd year) - the first year wasnt that great but the second reincarnation of Duel Live was excellent, with about 6 or 7 actors inside who really made you jump as the car went around. Also gave you chance to once again soak up the atmosphere of the Haunted House as it should be.
Haunted Hollow - think it was around 2007 when there were 3 actors here. The grave digger, the coach / horse driver and the girl ghost. They added smoke and green lighting to the Hollow and it was excellent to walk through late at night.
Boiler Room - always one of my faves, think it was about 3 or 4 years ago when it was up by FoTS, the section with the inflated walls closing in on you, highly claustraphobic and actually considerably hard work to push your way through!
While I appreciate change is neccessary, sounds like for 2012 Alton are taking a step backwards rather than forwards, especially with regards the lighting when 2011/2010 were excellent with the atmosphere inside the park.