There's a lot of posts here about mapping. I'm not the most active mapper myself (the last two complete maps I made were Ancient Aliens MAP31 and 32in24-14 MAP21), and I'm aware that my lack of motivation to spend lots of time and effort on maps means I might never make a map of the same large scale as other people do. But that's okay - I still like making smallish maps every now and then and trying to make them reasonably fun and mildly interesting.
Something I can kind of touch on, though, because it's my equivalent - is composition. (I was involved a little bit with Eviternity in this area, so I feel like I can comment :P) @Deadwing already mentioned music making in terms of MIDIs, but for me it goes to a whole other level. I'm currently in my second year of a masters of music in composition at (allegedly) one of the world's top institutions (according to itself, anyway - some of my friends disagree). It's great, and I feel really lucky to have gotten accepted in the first place (and incidentally I would have never gotten this far without all the practice I had writing midis for Doom projects!)
However, I'm surrounded all day by other composers. In addition to the other students studying there, every week we get either a professional composer in to talk about their work, or a staff member giving a lecture about a composer too famous to bother to come and talk about themselves in person. Every lesson with my tutor, he shows me examples of compositions that he thinks will be helpful to me. The majority of all of this music is great. A lot of it is of such a large scale, or of such notoriety, that I have a very similar reaction to @obake. It's HIGHLY unlikely that anything I write, at least at this stage, will be at the same level. (Just look up Messiaen's Turangalila symphony! How can I ever compete with that?)
Over time, though, I've realised that writing these kinds of large-scale 'serious' works isn't something that I necessarily want to do at this point. What's important, I think, is finding your own unique style, and if possible trying to present it in a new and interesting way. My music is fairly different in style to the vast majority of the other students here and the staff. It's actually drawn some criticism from the head of the department, though I think he's a bit biased. However, this same style has already brought me places I wouldn't have gone otherwise. Eg, a month ago one of the senior lecturers received a request, from a clarinetist putting together a new clarinet choir, for a new piece to be written by a student. The lecturer gave this opportunity straight to me because he felt my style would fit the ensemble the best! I also am fairly optimistic about being able to break into certain specific markets (wind band/brass band in particular) because that's something that my own style lends itself well to.
So what's the point of all this ramble? I guess it's just to figure out what you want to do, and what you're prepared to do. Maybe you're not prepared to spend days and weeks and months on a single map. There's no problem with that! If the map manages to be fun and interesting to play, nobody will care if it only took you an hour or two to make. And make sure you enjoy mapping! Personally, even if I only ever wrote midis for Doom projects and never got anything performed in a concert, I'd still be happy. I don't write music so much for the notoriety, I write music because I have to - because I can't imagine not doing it. It's still hard work of course, but I will willingly put in hours of effort into a piece because I have so much of a blast doing it. (Most of the time.)