For me, if we're not using git I could get the other dev's latest changes by simply doing a file copy of whatever I needed and then get it into my own environment. I work offline with most of my dev mates. We are rarely ever coding at the same time of day given time zone differences and sleeping patterns.
If we're a small team we're probably quite aware of where the other one is in the code and what they're working on. I don't need real time for that.
I think being able to see the other dev type in real time in the same file doesn't solve anything for me and may in fact be distracting and counter productive. I'm not sure 'real time' fits here.