I didn't mean to misunderstand your point, but I think it is not that clearly made in the original post, and now that you've said it clearly, I think it's a little irrelevant to the bigger question of governance and social change.
You're raising legitimate complaints about the brokenness of our voting system, and I agree. I'd like to see other voting systems put into place at local/state levels, with an eye toward implementing them nationally; something like range voting, or one of the other "pick your favorites" voting schemes.
Where I get the biggest sense of frustration in your post, it's the sense that we can't do much with our votes, e.g. when you said "the odds are against any form of profound change" and "I personally find voting to be not worth one's time".
Well, yeah, a vote on its own isn't enough to make the change you want to see. You do have to get involved, if people aren't already organized at getting your ideas out there, to get it to the level of being voted on.
My pot legalization example, I voted on that, but I know people who were involved in the GOTV efforts, the initiative process, the whole nine yards. But the whole years-long campaign culminated in a vote, the final test of "does the public buy our argument?"
Tell them about how it isn't even worth bothering to vote.
It seems like you totally misunderstand my point because to you "voting" is synonymous with majoritarian elections.