Several users have expressed a desire to see the all votes (negative and positive)
There's an even simpler solution, and it is already explained on the privileges page.
Once you reach 1,000 reputation, you can click on the total vote score displayed by any post to break the score down into the actual vote counts, given as the number of upvotes and downvotes.
I don't think the timeline view has earned "official feature" status yet, that's why it hasn't made it into the public user interface. It also provides a whole lot of confusing and unnecessary information for the typical viewer, so I'm not sure that more effort should really be put into promoting it. If people are active on Meta and need/want this information, well then it's available.
If, for whatever reason, you like to view this information frequently and want to make it even easier to access, you can install a user script that does just that. For example, this one adds a "timeline" link to the list of links displayed below each question.
I used to have it installed when I first came across it because it seemed like a neat novelty. I hardly ever used it, and I therefore haven't even bothered to install it again after reloading that machine.