As I explained in [1], the current ns3 Time API contains very cryptic method names S(), nS(), and uS(), which I argue are harmful for code readability.  I suggest renaming to Seconds(), MicroSeconds(), NanoSeconds().

I also argue that the extra typing does not really affect much code in practice because convertion of Time() to a numeric value is (or should be) seldom necessary.

[1] http://mailman.isi.edu/pipermail/ns-developers/2006-October/002468.html