If you consider yourself a good raider, you should definitely be seizing every single chance at upgrades and therefore progress. Be that bonus rolls, VP, enchanting, gemming, flasking, profession levelling, reputation farming... anything. If you don't, you're not a heroic raider. Or at least, not the best you could be.
Your contribution to a guild, no matter how hardcore, doesn't end in "smashing buttons and doing lots of dps". You could well have killed Ra-Den 12 times, and still not be a good raider; dragging your own guild down because of sheer laziness.