I won't be there as I'm in the states now but I HATE derby matches. Much much too stressful. 
This - especially as we live walking distance to Bramall Lane (less then 10 mins)
The derbys of late, havent been as bad as they used to be - well at least on this side of town. The first one I experienced in 2006, buses were diverted from West Street and riot police (with horses) were out in full force. All the bars on the road were closed as well, except for one. Though this seems to be more the exception than the rule. I guess police presence is stronger when they believe things are going to kick off.
Ive only ever been to two matches (WEDNESDAY!) but both were because of partners work and he won box seats with lunch. We'd like to go to more, but it requires planning that my OH and I are too lazy to do, so we just dont go.