It's probably fair to say that there's a roughly linear trade-off between battery life and ease of use, because friendly user interfaces need a lot of power: At one end you have the smartphones with user-friendly apps and the TomTom-style motorist[1]-oriented satnavs - reasonably easy to use in a "take me to here, via here and here" style, but battery life that's incompatible with a full day's riding. At the other you have the hiker GPSes like the Garmin eTrex series, which will happily run for 2-3 days of touring on a decent pair of AA batteries, but with complicated and often downright quirky user interfaces that have evolved from their device-that's-designed-to-supplement-a-map-and-compass heritage. The bike-specific GPSes are broadly similar, but with features aimed at people who do Sport and Training and stuff. They suffer from integrated batteries.
Depending on what particular flavour of luddite you happen to be, you might be quite happy with tediously entering waypoints as coordinates into a hiker-oriented device, or you might insist on an easily scrolled feature-rich map to click on. Either way, the auto-routing ('from A to D via B and C') is going to be occasionally quirky and/or at odds with your opinion of what's a sensible cycling route, because that's the nature of maps. The outdoors type units allow you to upload a 'track' - ie. 'a line on the map' which can be displayed and sometimes actively prompted as you follow it, but creating tracks tends to require a proper computer of some sort[2] running route-planning software, and transferring them to the GPS can be awkward from mobile devices.
If you're a luddite with a smartphone, I suggest you start with that and some free/cheap app(s), and get an idea of what it's like in use before investing in more practical hardware. If you're a luddite that's allergic to learning curves, I suggest you either lower your expectations[3], or better invest the effort in a really nice paper map holder.
[1] The ones designed for motorcycles are viable options on a bicycle, but power efficiency isn't a design priority.
[2] Possibly a web-based service.
[3] Eg. Many devices do an excellent job of showing "you are here" on a live-scrolling, waterproof, backlit zoomable map, which is extremely lovely if you're happy to use your brain for the navigation and not bother with the advanced features.