^^^Some of the feel that Borg drones were "happy" to be drones may have come from Seven's desire to rejoin the collective. She felt safe and superior to unjoined minds there - where that feeling came from is anyone's guess - perhaps the thought that there is strength in numbers and might makes right factor in.
A Queenless collective would've been very scary because there is not that one position you can eliminate to topple the group like a house of cards - the idea of an implacable foe that keeps returning regardless how many others you eliminate is alien to human minds - insect like - drones willing to truly throwaway thier lives to move the rest of the group forward without ANY reward for themselves is untenable for many people.
A Queenless collective would've been very scary because there is not that one position you can eliminate to topple the group like a house of cards - the idea of an implacable foe that keeps returning regardless how many others you eliminate is alien to human minds - insect like - drones willing to truly throwaway thier lives to move the rest of the group forward without ANY reward for themselves is untenable for many people.