Well, lets not worry about winning or losing the argument and worry about safety. I think pretty much all that can be said has been said.
I will leave it up to people reading through the thread to decide for themselves what they feel is appropriate.
Once again, I do feel that it is inevitable that pilots will get airborne with towbar on, fuel/oil caps off, baggage door unlatched, etc. Doing a final check in my opinion just once before each flight is almost certainly likely to catch these items. One should consider that Photofly feels that this is unnecessary for reasons such as "If you missed the loose fuel cap on your walkaround, what's to say that you'll spot it on your final check?" Meanwhile, Digits feels that some of the items I suggested such as baggage door opening are in his opinion not critical. As well, it has been suggested that doing a final check could give someone the impression that your walkaround is less important, so this should be considered prior to following through on my advice.
As well, I will still recommend after all checklist are complete prior to takeoff, to check those critical items that if in the wrong position could lead to an accident as it has happened so many times. However, one should consider that photofly feels that this could make someone less likely to utilize their checklist properly and Digits feels that the result could make a pilot feel that items on their checklist are not that important and make it more likely to miss something on the checklists. Obviously these are things that one should consider if they decide to follow my recommendation.