Education/knowledge on synths is pretty necessary unless you want to fiddle with (typically bad sounding) presets all day long. Unlike most rock instruments keyboards are NOT self-evident and require some knowledge to utilize--more so than guitar, bass or drums.
It's small wonder that most synth players are tech-geeks at heart. Between sound programming, optimizing for live performances, possibility of sampling, tweaking, MIDI and dealing with the fact that for the most part no two synthesizers have the same *capability* for sound, much less sound, it can be daunting.
Don't understimate the variability of synths--it's not like guitar where most guitars can play similar stuff and achieve similar tones easily. A "synth" will many times not be able to even approxmate the sound of another synth--so if you have a specific type of sound or sounds you may have to get 2-3 keyboards! Heck, at one point I had SEVEN synths to get the sounds I wanted, ranging from expensive vintage keys--OBXa and Prophet 5, to analog monosynths--the Korg Mono/Poly, to vector/waveshaping synths like
the Korg Wavestation, to sampler/synths like
the Kurzweil K2000, to digital PCM rom based synths like
the Roland JD800, to physical modeling keyboards like
the Korg Z1.
It can get heady. Learn synthesizer history too. Know what
a Jupiter 8 is, what a Fairlight CMI was,
an Emulator II,
a Yamaha DX7, ARP Odysseys, a Korg M1,
an Access Virus, and so forth. It's actually pretty interesting.