But I won't dispute that Java has changed the face of programming when comparing worlds before it existed and after, although many languages can make that claim, including C, and probably C++. I'd not be surprised if even BASIC could not be said to have had such a dramatic influence on programming. Fortran and COBOL would be up there as well, possibly even greater than most of the others combined.
It can... although usually I dock all my editor windows to one pane, and use tabs.... but the IDE I use allows me to add any number of panes.
It's interesting that many of the things you've mentioned are ideal for you actually are preferences of mine as well, and in fact, why I use the IDE that I do. It's written in Java, but it performs adequately on my hardware, which for me is all that really matters.
Communication fibers are solid, not hollow. Making them hollow would would end up completely defeating total internal reflection that fiber depends on to actually send over a distance.