It's pretty hit & miss depending when you go through. There certainly have been extensive queues in T2 security over the last week or so-including fast track.TUI check in appears to be hot spot as well at the moment. The splitting of Jet2 between T1 & T2 is pretty retrograde and shows a lack of planning.
I've been through T1 & T2 several times since Christmas, security time has varied from 10-60 minutes. However, it's not just that, its the crappy infrastructure in T1 - the lack of seating, the lack of food outlets, the lack of cleaning, the lack of things actually working that makes MAN a grim experience. I'm back to Asia next week & have changed my ticket to originate from LHR (because I can).