If you want good mapping capability, then you need to put up with all the features you say you don't want. If you are expecting the mapping capability you have on a hand held unit or a marine chart plotter, then you won't find that on a GPS that is expressly made for cycling. IE, Garmin Edge and others.

For many of the Garmin handheld units there is a mount that is made to put them on your handlebars. Topo maps aren't a big deal to me on the bike even though they are there. Nor is planning a route on my Edge device. I've usually looked at those well before my ride and know what's where along the route I'm doing. So think about whether you'll be actually planning your ride and routes with the device, or will you do that with a computer or other device prior to your rides.

Courses/Routes are just too easily planned and drawn with other websites or mapping tools on a pc or mac and then transferred to the gps device used for the ride.