We've gone the last five years, with the following group make-up:
2003 - Me, DW, DS7, DD4
2004 - Me, DW, DS8, DD5
2005 - Me, DW, DS9, DD6, DD 3 months
2006 - Me, DW, DS10, DD7, DD 16 months
2007 - Me, DW, DMIL, DS11, DD8, DD 2.5, DD 3 months
As you can see, our group has grown increasingly large, with increasing numbers of small children!
Have the buses sometimes been a problem? Yes. Have they been a problem every time? No. With the little ones, my DW had them in a Baby Bjorn, so holding them wasn't an issue, but it was difficult with the other little one, who needed someone to hold her. The older 2 were OK either way. There were times when we all got seats, the bus didn't fill up, and we kept them. There were times when we all got seats, the bus filled up, some people w/o kids were standing, and we still kept them.
There were times when we all got seats, the bus filled up, got real crowded, some elderly people or pregnant women or people holding small kids were standing. What did we do, EVERY SINGLE TIME? Depended on which year. The first 2 years, we ALL stood, b/c we ALL could physically, and we could ALL make it easier on those who had it tougher. The next 3 years, as we had smaller babies, my DW needed to hold them in a seat for safety reasons, but myself and the older 2 could, and did, stand so they could have seats. This past year, I made sure my DW and DMIL had seats, as they were carrying the smaller 2, and if there was room for the others to have seats, they got them; if there wasn't, or there were people who needed them worse, they didn't. They know the drill, and I tell them why they have to do it.
In my book, no able man should be sitting, when elderly/pregnant/child-carrying people are standing. Period. For me, that includes my able children. That's just the way I was raised, and I find it respectful. I personally think it's rude to do otherwise. If my wife carrying an infant (or any elderly/pregnant/child-carrying person) is standing on a bus, and an able man is sitting and can offer her his seat, and doesn't, I personally don't think any more of that man than I do a pile of whale crap. It is completely being selfish and looking out for what's best for YOU, rather than what's best for others. In my opinion, that's a lot of what's wrong in this world.
Anyone, of course, is free to disagree, that's your right. There are those who say that "first come, first serve", or "wait on another bus." And like I said, that's often the mindset. But also as I said, I was raised to help and respect those less able than yourself, and that applies on Disney buses as much as it does anywhere else. Like I said, too much thinking of ourselves, and not enough thinking of others.
Out.