"too much affection" is correct and usable in written English.
It is typically used to describe a situation where someone is showing excessive love or emotion towards something or someone. Example: "I appreciate the thought, but you are showing me too much affection with all these gifts."
I have too much affection for Scotland to want it to become a foreign country.
He had sunken jowls, and all but five teeth were gone, victims of too much affection for sweets.
I spent the evening chatting with her while avoiding direct interaction with Ben for fear I'd show too much affection, or too little.
Will Arnett and Amy Poehler play the Van Waldenbergs, a calculating brother-sister team with a little too much affection for each other.
The Danish central bank took this step to fend off unwelcome upward pressure on the krone, which is pegged to the euro, at a time when the single currency was suffering from too little rather than too much affection.
A conventional close would indeed bring Simon back to Earth, and Buñuel seems to have too much affection for this obsessive among obsessives, the holiest of his holy fools, to allow that to happen.
A sweetly randy tale of ex-lovers trying to maintain a platonic relationship, Leslye Headland's Sleeping With Other People (Icon, 15) feigns to satirise romcom tropes, but finally has too much sincere affection for the genre to resist them – which is fine, since the writing is quick and lively, and stars Jason Sudeikis and Alison Brie have an actual connection.
"I had too much respect and affection for Gene to treat him as if he were an inferior player who could be given a set for his troubles, rather than a condescending pat on the head," he was quoted as saying in "Bud Collins Modern Encyclopediaa of Tennis," by Collins and Zander Hollander.
There seems to be an underlying idea that if mothers give their sons too much love and affection they will grow up to be gay, which has to be hard for black mothers especially when many believe their sons are possible targets for racism, victimization by police, et cetera and they want to keep them close to save their lives.
I'm very grateful to X too, and proud of how much affection and humanity we have managed to preserve in this process of unravelling.
I'm not going to attempt to draw a line as to where public displays of affection become too much to stomach, but what happened here did not cross that line.
