There is def two sides to it. The meeting, studying, preaching, assemblies, etc... Is all a big waste of time. But, in my opinion the friends, vacations, dinner dates, parties, etc... Are fun. And I enjoy them. I know that I will have a hard time replacing my friends when I leave.
Being a witness definitly does not not have some deep meaning or fulfillment. But is life outside of the Borg any different? I can't say because I have only experienced life in the Borg up to this point.