1v1 ladder tends to be more stressful and intense than I'd prefer. Also, I find the gemeral amount of t1 tank-focused gameplay on 1v1 ladder to be far higher than my preference. I would play way more ladder if there was a mapgen-only queue for it.
Btw, I think a lot of the disagreement over the level of importance of BO's might have to do with different people having different definitions of what a BO is. I think some people mean BO in the sense of a very specific build order that is done for several minutes of the game, while some people just mean a relatively specific build order for the first 1-4 minutes, while some others might just mean the general level of familiarity and understanding of a map that a player typically gets after playing it a few times.
Personally, the first time that I play a map that I haven't seen before, I generally perform notably worse on it than the 5th time that I play it, and I'll generally play even better on it by the 10th time, etc. I think that's normal. I think a lot of the people saying BO don't mean precise BO's in the sense that a 2k+ player might mean, but instead just mean that general level of familiarity and understanding of how to play the map and various details regarding its meta and such that normally develops after a few games on it.