It really depends on what you consider endurance running. A marathon distance is quite different than a mile and even a 5k. But all the above require training at various paces. You tend to train your endurance, lactate threshold, vo2 max and pure speed in different ratios depending on the distance. Granted many runners don't push themselves that much but to each their own...
As for boring I have been doing it for 25 years so I'd have to disagree. I have made most of my friends through running as well as my fiance. I have run a high 4 minute mile and a sub 2:50 marathon. I have run boston twice. It is my constant companion through the highs and lows of my life. I'm also basically the same weight I was in college 20ish years later. Any place I visit I can get a workout in with a pair of shorts and shoes. I have run in london, istanbul, amsterdam, paris, buenos aires, vancouver, rome, venice and many american cities and many rural areas and digesting a new place at a slower pace than driving is really special in my opinion (I realize I am very fortunate to have been even able to visit those places).
I would also argue that it's not running that promotes injury. It's the 40+ hours a week of sitting most of us spend on our asses. How do you expect your hamstrings to work smoothly when they live in that shortened position most of the time?
I run about 30 miles a week currently (much less than my 50 to 60 of yesteryear) and I do find as I get older I need to spend more time on auxiliary exercises to be a more balanced athlete and human.
Anyways... Probably not going to convince you but at least this is a counterpoint.