Even with the 8 foot bed, the bikes sometimes go in a hitch rackThis is one of the reasons I bought a 6'4" bed. My bicycles will not fit straight on in the 5"4' bed making carrying more than one bike difficult. I see guys with 5'4" beds with bicycle racks in the trailer hitch.
Also if you fish or ski that extra distance may be the difference between being able to fit your stuff in and close a tonneau cover or not.
The tonneau cover when rolled up might take another 6" out of your bed space for something like a bicycle.
There are real downsides to the longer bed length though. with the 6'4" bed you will be longer than a standard parking space. I've personally never had any trouble living in a densely populated city however it is something to be aware of. I would also recommend the 360 camera, it's a life saver in tight situations.