and it take literally no more than a minute to fill
Only on the generation game :-)

Find keys
take off seat (find somewhere safe to store it where it won't fall on a spade and get scratched
get scottoil bottle
attach feeder tube if not already on bottle
Remove cover from cylinder
Attach bottle to cylinder
Squeeze it in (you cannot do this too fast - like putting oil into a car via a funnel you have to wait for it to go down)
refit tube back on cylinder hole
find rag
wipe up any spilt oil including awkward places behind/below cylinder
put seat cover back on
hang up keys

As usual a bit of exaggeration going on about the pros unless of course Mitch has the McClaren put crew in his garage :-)

It's not a big deal, I wouldn't say it's massively more effort than sticking some wax/oil/spray on a chain either and we all agree both have to be done regularly (unless you buy the touring reservoir but that does not fit on all bikes - I know because I got it put on and then had to had it removed).

As it does require regular refilling - which takes about the same time as oiling/waxing/spraying a chain then this detracts from the benefits IMO.