Yeah try looking in the 7th edition rule book then not 6th! The rule book has rules for every terrain set
GW produces (P184-191).
Shrine of the Aquila box set gives re-roll to moral for imperial armies and hatred Imperium to others.
Manufactorum box set allows models who's weapons get hot to re-roll fail armour saves.
Basilica Administratum box set let the a unit who identifies an objective a re-roll on the Mysterious Objective table.
Sanctum Imperialis box set grants Adamantium Will and night vision.
Battlescape box set grants cover regardless of line of sight obscured.
Crashed Imperial Aquila Lander box set has a lot of rules from blowing up to granting extra victory points.
Twisted Copse (just woods don't worry about it...)
Moonscape set gives 6+ cover and a +2 to go to ground saves....
The problem with the Mantic stuff (apart from looking really nasty) is it can be a little to ambiguous as to what each building is and it then become a bit of a fight to who wants what item to be what. This can lead to a one sided forced advantage much more regular than pot luck of what was in the terrain box. At the moment people are just ignoring the terrain rule altogether as the current stuff is very unsuitable for the task.