yes ,slow pulls are boring but i think most of the healer community wont be angry at you just annoyed a bit that its slow depending on how their day went ^^.
as for big pulls,if you or the healer cant handle big pulls then go slower usually the rage come from tanks who keep doing wall to wall pulls when its clear either them or healer can't really keep up.(tank takes too much damage too fast for the healer to keep up)

as for my mentality i always think slow pulls is because tanks don't trust their healers so i try and make the tank feel safe with taking bigger groups but i still respect the slow pull nonetheless.