I've just never had a problem with it. Yet the alpha strike is so awful I hate 40k. I do think you're on to something though. Locally most the 2nd turn haters are primarily 40k players.
My first miniatures game was AoS just when 40k 8th was coming out. Everything about AoS, including the double turn just seemed so much faster and fresh, while 40k - even in 8th edition felt old and cumbersome.
I know people love the games they grew up with, but the double turn is a great, fun mechanic that adds excitement and depths of planning to the game. Endless spells add even more to it, position them in ways that force your opponent to want to give you the double turn.
Also, how often are you seeing first drops going second, most want to go first to secure objectives (mission depending). Usually I see people fighting for the turn 2 into 3 double turn.