This is pretty basic, but dropper posts were invented for mountain bikers to lower (or raise) the seat using a handlebar-mounted quick release. Many like to lower the seat for downhills to let them have more control and use their legs as shock absorbers, but want the seat higher for level ground pedaling efficiency. However, dropper posts can be mounted to most bikes and you can use the control to lower the seat to make getting off and on the bike easier. Depending on your bike's geometry, one might be able to mount a 170mm dropper post, which would provide over 6&½" of seat travel, which makes a big difference in ease of bike dismounting and mounting.