Personally, the game isn't bogged down with sidequests, and every NPC that does have done is pretty static, so they won't run off at random times like in Xenoblade. For the few sidequests there are, you can always check back with the NPC who gave it to you, and they're pretty easy to remember, IMO.
Look, I know i sound horribly biased, but even after coming off Xenoblade, which is like, officially one of my favorite RPGs of all time, I enjoyed the crap out of this game because it does what it does really well and in a streamlined manner.