The more the better. I also prefer big worlds for obvious reasons.
But i do use micro worlds like forgotten hollow. For me it really depends on the world itself. Forgotten hollow is beautiful imo and has this different and interesting sun cycle so i use it a lot. On the other side magnolia promenade hasn't got my attention at all...
About hidden worlds so far i have only been once to sylvan glades (is it the name? I can't remember well...). But i won't be back soon cause i agree with you. It's just too much work to go there.
