Is how I might rudely reply to someone asking me to pick one, absolutely key, aspect to enjoyable gaming*. There needs to be characterful scenery and plenty of it. An open battlefield simply won't do. Players of skirmish gamers know this very well. But there's an odd situation at present with WFB, where 8e calls for (demands even) hordes, but GW also provide some excellent and reasonably inexpensive scenery.
Until recently I had depended on old card buildings to provide the scene for games. However, having amassed so many miniatures I don't know what to do with them all, I reasoned I ought to turn my compulsive buying in the direction of some buildings of substance. Here is a Chapel I've had knocking around for a while, and a new Watchtower, both WIPs:
Pretty standard stuff at the moment. Yet I've noticed how easily these can be combined to make a whole range of great looking buildings. Hence, that's my new obsession. I may try something with the SKULLZ GW buildings if I think I might be able to make them look half as silly. That's a long shot though...
* Luckily I'm a jolly nice fellow and would never be so disrespectful ;-)