From comments here it seems that not all SO sites adopt the same convention regarding up/downvotes questions on Meta.
I'm mainly familiar with ELU Meta, where as this question illustrates, a downvote usually means "I disagree with OP's suggestion", or "I don't think whatever OP is complaining about justifies changing the current status quo".
Presumably the (current) five downvotes on the ELL Meta question Add a symbol to the user box to identify the user's first language are intended to be understood as "No, we don't want to pressure ELL users into advertising their native language any more than they can do at present".
I will be perfectly happy for ELL to explicitly adopt and endorse the convention, so by all means upvote this question if you feel the same. Or downvote it if you think, for example, that people should upvote what they feel are "good" Meta questions, even if those questions explicitly or implicitly endorse a position they actually disagree with.
Apart from that one example possibility, I shan't make suggestions myself about what alternatives to Upvote=Agree, Downvote=Disagree might be implemented, or attempt to justify using that convention here as well as ELU Meta. Let that be done in Answers that can be voted on here, so it can be clear that whatever position is adopted does indeed represent a consensus for this new site.