I suppose I understand that you can’t smile or frown a line of dialogue, but the way I read things like:
“I would love to,” she smiled.
is that the Smiling happened AFTER the line of dialogue she said whatever she was going to say, then smiled. Thus combining the dialogue tag with an action so you use less space on something that’s not that important but more exciting than just watching this woman say “I would love to” without any kind of additional statement to show whether she was really happy or just monotone.
“I would love to” she said. could be read in so many different ways.
“I would love to,” (gut you, you pig.)
“I would love to,” (go on a date with the most dreamy guy in town!)
“I would love to,” (not really, but I’ve got no other choice but to be polite)
But, by writing: “I would love to,” she smiled.
It implies that she is actually happy, or at least mildly interested in participating in the proposed action, since she smiled after speaking.
does that make sense to anyone else?