Indeed the human sight are pretty limited, actually the 27" screen i sit in front of now ( 1080 p ) as my nose are only 60 CM or so from the screen, i am pretty sure what go on not least out towards the 2 edges, are to a large degree extrapolated on by my brain to trick me to think it is one large crisp / sharp image i see.
But really it is probably only the center 1/3 of the screen i see as clear and sharp as my brain tell me i also see the other 2/3
Still resolution have its merits, otherwise a lot of people will be buying a lot of unnecessary stuff over the years that have been and are to come.
And the new Sony 61 mpix Dslr, are huge overkill.
And i totally get the problem of uploading huge files on a narrow band internet connection, all i can recommend is to shoot short sample clips, in the kind of areas where things like contrast / sharpness ASO can be gauged.
Uploading a whole video are not nessesary, just some short clips that highlight the performance.