Had a few minutes of spare time recently and used them to go back over some of Stephen Hawking's works. I was re-reading the very basic descriptions of the relativity principles. While a lot of the subject is still challenging, I feel like I am least able to identify some of my own mental block. The notion of Time as variable just doesn't fit with human experience. I mean, it may make sense in the mathematical equations, but it is as unimaginable for me as additional dimensions of space.
I suppose it could be easier to accept Time as a variable and Velocity (of light) as a constant if velocity was not always expressed in terms based upon time units. Maybe we should refer to all velocities in relation to the light speed constant and leave off the "per hour" part of the description.