In my neck of the woods all the old church pews were made of pitch pine which seems to be almost impervious to everything except fire (makes brilliant but expensive kindling!). Many of the really old big houses had pitch pine window lintels on the the inner face of outer walls and these lintels seemed to survive damp, beetles, rot etc.
Watch out for splinters as they turn septic quite quickly if you leave them in place -they're a bit painful for a few days then you can just squeeze them out.
I've been using pitch pine pew ends recently to make parts (buffers and wheels) for some big oak planters which look like railway rolling stock. The original parts had been made from plywood and softwood which had rotted and fallen apart - the new parts in pitch pine should last for many, many years.
The Tiddles is correct, it is nice stuff to work with and the turpentine smell from it is lovely.
Tell the wife that saving this wood for the correct project is definitely not a waste of time or space.