I assume you have not been there. I am sure many would disagree with your statement that it is not that unusual a layout. What has Nice got to do with it - comparing them is like comparing chalk and cheese? The taxiway in Nice is not TWICE the width of the runways, and neither is it between them.
I fly to Sofia regularily. It has never occured to me, that it would be a difficult airport to taxi. I have been there in summer and winter, in sunshine, TS, snow, day and nighttime.
What does Nice have got to do with it? Well, maybe you haven't been flying for too long, but that southern runway is new, and the parallel taxiway used to be a runway...