It's weird - I used to be a bit obsessed with timetables and I'd spend hours making them up with my sister (we had a really long running game of "boarding school" which went on for years and years) but then I mentally run screaming from the idea of a routine, anything repetitive, I hate the idea of it. Even though in fact if I wrote down everything I do over the course of a normal week, you'd see a lot of patterns emerge. I think I'm really spontaneous, but I'm actually a creature of habit. And then my ADHD friend pointed out to me that once you have the timetable, you don't have to be anal about it, in fact having a timetable frees you, in some ways, to be more spontaneous. Without it, I can blow off the grocery shopping to do something else, but if I know I'm supposed to do it at X time, I can let something else interrupt, but then I am aware that I have to reschedule, rather than assuming I can do it "later" and it just fading away and disappearing from my radar entirely until we run out of food.
I think that my biggest turn off to routine/schedules comes from when DS was a baby and I totally rejected any advice to get him into a routine. It turned out by the time he was one, he insisted on a routine and was so much more settled with one. It drove me crazy! But it's a mental block, really. I realise that my friend's advice makes a lot of logical sense.
True Eau. ALF - look at the articles in the OP from ADDitude magazine. I find them really helpful. I did identify a lot with the ASD list, but some parts of ASD literature feel totally off to me. And a lot of people's personal experience in the thread, I don't relate to (but others I relate to a lot.) I find the ADDitude articles resonate much more closely with me. But you do have to look up the differences between inattentive type and hyperactive type, because I never would have considered ADHD as a thing because the hyperactivity just isn't me, although I do fidget, and do the compulsive multitasking, and never stop talking, and......
Anyway my point is a lot of articles do contain components from the hyperactive type, so you have to do a bit of filtering out the bits which don't apply to you.