How about you read the fucking manual?
How do you think other people learn how to use synths, seriously? The fact you've "been producing for 3 years" and are still using presets for everything is laughable. What the hell have you been learning/trying to do?! I'm probably coming off as a bit of a dick right now, but seriously I've been producing on/off for 1.5 years and would consider that I've learned the ins and outs of multiple Synths and VSTs over that time not to mention my DAW, FL Studio. Mainly just by sitting down and toying with things, if I don't undertand something I either look it up in the manual/website/a forum/youtube etc or alternatively I deconstruct a preset that utilises the function I'm cofused by.
In my opinion Massive is one of the easiest synths to use, the routing is quite sequential through the interface (as in the synth itself is practically laid out in the order you should create a sound; wavetables > filters > fx > post fx/filters bam.) and linking paramaters is very easy through the nice drag and drop mechanism, even compared to something like z3ta which is also has quite an easy interface... Massive seems like childsplay in comparison.
Also fyi Nexus is a rompler, not a synth, doesn't get any easier than that.
Edit: As I was writing this apparently you wrote your post above, I'm now inclined to think this is just a troll considering your post count, ah well... wouldn't surprise me if this was a legit thread.
