Those people who think panniers take a long time to fit or remove, you must be using the wrong style.
For touring, it may be OK to have a slow-fitting system, you put them on in the morning and take them off in the afternoon.
For my riding around town, I often remove the bags 4 or 5 times. Modern clip-on fittings take about a second to attatch or remove. Not all modern panniers have modern fittings, but Ortleib and even the retro styled carradice have them. You shouldnt mess around with hooks on bits of elastic.