If you are happy with SH3 and all the Mods plus you have limited time, and who dosn't, just keep playing shIII and enjoy.
I still have not been everywere and done everthing in GWX. I still look forward to tuning out the world and going looking for trouble in my IXB.
That does not prevent me from jumping up, grabbing the monitor and screaming: gim me, GIM ME
, GIMMMMM MMEEEE......when the subject of SHIV comes up.
Afterwords I just lay on the floor and sob for a while.