I have a set routine that I NEVER deviate from and NOTHING gets done including peeing, having a beer or putting anything else away until my rod & reel are safely stashed and the beer doesn't happen until EVERYTHING is put away because I know me.
When I am fishing alone, I have a rod/reel holder I made that attaches to my SUV on the driver's side. My rod goes in that while I cut off the fly, reel in the line and start the disassembly process. Once the rod & reel are safe in their tubes & cases, the other stuff gets put away one item at a time WHERE IT BELONGS in the gear bags in the back of my SUV.
If I am fishing with others in a single vehicle, I wait with my rod in my hand until everyone else stashes their gear before I'll start, or if I get the opportunity I'll stash mine first to reduce confusion and the urge to put things down where I could forget them. When I fish after dark, I check around the car with a flashlight before departing.
Conversely, when arriving at a fishing spot, my rod is the LAST thing I take out of the car when getting ready. Early in the process I'll attach my rod holder to the car and when I have everything else ready and on me, I'll put in my rod & reel in the holder while I string it up. When I'm done, I secure the rod in the holder and have a beer or two.
When I'm done with the beer, the rod goes to my hand while I take off the rod holder, toss it in the back of my car, close the door & lock the car.
I never lost or left a single item of tackle behind using this method...
...even after the beers!!
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)