Quote Originally Posted by Millerna View Post
"Grinding is a term used in video gaming to describe the process of engaging in repetitive tasks during video games."

So, doing quest after quest for several hours is just as much 'grinding' than killing a lot of mobs in a group. The difference is that in a (good) group you actual get to be social and meet other people
You can also get in a (good) group to be social and meet other people with quests, quests doesn't mean all will be solo quests, there are plenty of group quests and dungeons are mostly tied with quests as well.