Rok, I can't think of a time that I heard something by Sonny Rollins that I didn't like. "+3" is one of his best. Sonny is one of the greatest and most influential of the modern tenor players. Miles considered him to be the greatest tenor player ever (!!!). He has a very distinctive style and an extraordinarily powerful musical persona; particularly when it comes to rhythmic feel. His sense of rhythm and projection of it is so powerful that, unlike most players who play with or to the rhythm section's groove, the rhythm section often seems to be playing to HIS groove; he is a very commanding musical force. Of special note on this record is the unusual (for him) use of fast vibrato on the ballads like "They Say Its Wonderful". You are absolutely correct in your observation that he sounds like he knew what he was going to play ahead of time. While I doubt that is the case (strictly speaking), I think what you sense is his incredible sense of confidence while still being spontaneous. While Cranshaw is a great player and, as you said, if Sonny wants electric bass who are we to argue, I am with you about electric bass in jazz in general; have never liked it. But, let's hear (read) the reasons why from the horse's mouth (so to speak):
http://jazztimes.com/articles/20314-bob-cranshaw-shop-talk
http://jazztimes.com/articles/20314-bob-cranshaw-shop-talk