That very well expresses our perceptions of time. As does you other observations about the block universe and line segments.

For me, the block universe idea is an interesting thought experiment about a way that we can conceptualize time. It has no ontological value, though. It's an example of why I get so frustrated with analytic philosophers who continually fall for the fallacy that if they can express something mathematically it must have existence.

I will defend the perception that time flows and has direction because that is what we observe. The second floor-first floor analogy is incorrect. The reality is that we see a sequence of impressions: 1. a burning match touching a sheet of paper; 2. the sheet of paper burning; 3. a pile of ashes where the paper used to be. We do say with good reason that the paper no longer exists and that change has occurred over time. We have very good reason to think that time flows and in a one-way direction because ashes do not reconstitute as paper.