I own (with a partner) a Libelle H-301, a German fiberglass glider built in 1966. We keep it in a trailer at the airport and assemble it before every flight.
It takes me 45 minutes from getting out of my car to being ready to pull it to the flight line, so I figure the assembly adds about 30 minutes to a normal pre-flight. I need one helper to put the wings on, which I secure by inserting a single spar pin. Most of the control hook-ups are automatic, except the ailerons, for which I need to insert two pins. I then tape the gaps between the wings and the fuselage and go fly.
The automatic control hook-ups are a very big deal. Older gliders need each control to be connected and safetied manually. A glider pilot is supposed to always do a "positive control check" as part of every pre-flight, but every now and then somebody forgets. This was and continues to be a major source of accidents, usually fatal. Newer models have gone to all-automatic hook-ups, which makes assembly much simpler and safer.
So here is my perspective: daily assembly of an aircraft designed for that is really no big deal and, assuming it has automatic control hook-ups, it's pretty much impossible to do it incorrectly. I imagine folding wings (as opposed to removable like in gliders) make the procedure even faster and simpler.
That said, it's the trailering part that I'm really not keen on. We take our glider on the road only a few times a year, but I figure those times are much riskier than a year's worth of flying. Things have a way of loosening up on the road and every pothole can cause thousands of dollars of damage if something is not secured properly.
Case in point: one of our club's Blaniks (aluminum) landed long at a high-altitude airport and run into the bushes. Fairly little damage, mostly dents in the horizontal stabilizer. On the way to the repair shop, a wing slid off its cradle and the wing tip was damaged. On the way back from the shop, a turnbuckle holding up the fuselage broke, which resulted in some wrinkled skin. Back for more repairs, after which it made the trip to the airport successfully. Overall, the cost of repairs for road damage exceeded that for the original runway overrun.
Now, a modern, well-designed, purpose-built trailer can significantly reduce the trailering risk. Even so, I'd much rather keep my aircraft at the airport...
Boris