I use my bike for utility, leisure and touring and record the daily mileage on MCL and have/had an annual target mileage which I see as an incentive to get out and take some healthy exercise, although I have never recorded speeds or hours on the bike.
The computer is handy on tours and helps me decide when and where to stop for the day, ensuring I don't overstretch myslf distance wise, or stop too early due to perceived exhaustion!.
I have a gps bought for another interest but don't use it for following the tour route, really can't be bothered with the faff of plotting and planning a tour, instead prefer to use a map and follow my feelings on the day. However, following an unfortunate experience abroad when the local constabularly helped me find my campsite in the dark, I now record, without fail, the position of my tent on the gps before cycling into town for a meal etc..Thus the gps provides ease of mind for getting back to tent or hotel after evening excursions.
My camera is used mainly to record shipping and ship related subjects, also quirky things seen along the way rather than stunning landscapes. I would feel the effort of a cycle tour had (almost) been wasted if I didn't have a load of pics to review years after the event. Also, studying the pics at home I often spot things of interest that had evaded me when the photo was taken. Reviewing tour pics long after the event gives me much pleasure.
On tour I keep a diary in a ruled notebook recording places and incidents that amused or interested me along the way, people I met and any incidents that occurred but don't record weather or speeds, unless exceptional! Although I record daily mileage on the day, I seldom if ever refer to that data again, although reading over the text brings back memories, usually good memories! .
I think the electronics are a bit like alcohol, they can enhance the cycling experience as long as you remain in charge of them and not vice versa
