Completely agree with playing with EQ in a band setting - I spent years going round and round adjusting backwards and forwards, before I realised that what sounds good in a mix with the rest of the band doesn't always sound as nice when soloed, and vice versa. What really brought it home was using my Schreoder cab - the low mid bump doesn't sound fantastic on its own, but in a band context, it really delivers. Also a big +1 for attenuating issues out rather than adding more in - it's counterintuitive at first (it just feels more natural to add more bass, or mids, or treble to a problem sound to fix it), but it can work a lot better.
As someone else said, hours of fun!