OliverTwist, welcome to the forums.
Your situation sounds EXACTLY like mine. I pumped 2-3x/day from when DS was 6-10 months, then pumped 1x/day until right around 13 months. After stopping pumping, for a few weeks, I would nurse him as soon as I picked him up from daycare (around 4pm), but that late-afternoon session became erratic, then nonexistent because we'd run errands, take the pent-up dog to the park, etc.
We kept up with 2 nursings (morning & bedtime) until he was 17 months, then dropped the morning nursing, since he was waking later (daylight savings time!), and I'd have to leave the house before he woke up.
Last weekend, at 18 months and 1 week, he weaned himself. I never had any concrete plans on when I'd wean him... just figured it'd happen eventually. I do miss it a little and am a little sad. My supply definitely dwindled with each dropped nursing, but looking back, it made weaning a very smooth experience.
My son had no problems with cow's milk (he didn't like goat's). We introduced it gradually, starting around 13 months.