This bathroom discussion is interesting. My own opinion is that bare minimum NEED is 1, regardless of family size. I grew up in a family of 9 with three toilets and two showers, and even with 9 people, very rarely are three people in need of a toilet at the exact same time, so three was maybe overkill for us. Mr. and I have just moved to a smaller place with only 1 bathroom (old place had 2.5) and thus far the only downside is having to go upstairs to pee. Whatever.
I guess I'm more surprised that there hasn't been much discussion of bedroom size beyond a few mentions here and there. I'm finding myself baffled at large master bedrooms lately--I mean, I guess it's convenient to have a bathroom in your bedroom, but if you're not living with roommates, what's the point? I live with just my husband, so if I need to go to the bathroom in the middle of the night, I just roll out of bed and do it, even if I'm naked. I can see this changing when kids come along, but even then, my ideal would be a small bathroom attached to a small bedroom, and that definitely does not exist that I can find.
Our new apartment has two bedrooms, and one is noticeably smaller than the other, with a smaller closet. We're sleeping in the smaller one and I'm loving it. The second bedroom is for storage, and the big closet holds stacked camping gear more easily, and we have this huge dresser my in-laws gifted me that doesn't fit in the small bedroom. Bedrooms are for sleep and sex. I've found that any extra space beyond room for the bed and maybe a small dresser just ends up piles of clothes (probably could cut down on the clothes, lol). Plus I sleep better in a smaller space. I'd sleep in a large closet if I had one big enough to fit my bed :D
On another note, when we were moving out of the old place, which had an ENORMOUS kitchen, I was struck by how many cabinets there were, and how long it took to clean that thing, and how was it that I never had enough counter space in such a big kitchen? The new kitchen is more galley-style, with no room for a table or breakfast nook or whatever, and I LOVE it. It's big enough for two people to cook at the same time, but you're never reaching/walking too far to get something, and there's somehow way more counter space.
Mr. and I have now realized that our ideal house, assuming kids, is 3bd/2ba, small bedrooms, galley kitchen, open common area encompassing dining/living/family room, finished basement big enough for kids to play and for Mr. to set up his amps/speakers for guitars/bass.
And I too would love a small house on a big piece of land.