You can skip the "Colin smiled." line, and just imply it, using the tag.
"I'm sure the other patients will appreciate that as well," Colin said, pleased. "You been to the children's ward yet?"
Some of these actions can be left off, or expanded, or put into the dialogue.
Instead of Colin nodded (in agreement to Electron's "you know?") Colin could say
"There's that! xxxx
"I get that. xxx
"Makes sense! xxx
or some character-appropriate verbal acknowledgement.
I think the problem is you are moving the camera too much, or directing focus too much. In a two person conversation, tag lines are only needed every three or four lines, to help the reader keep track, but if Electron says something, then another person talks, it has to be Colin. If Colin says something, only Electron would reply.
You don't have to invent an action to inform the reader who is speaking; trust your reader to be imagining the scene. If you just want to break the text of their speech, just "Colin said." in the middle of it is enough.
If you want to slow down the "block of text", try to watch this scene in your head without the speech. If it is a still picture, perhaps you can find some way of making them have bodily movements, thoughts, perception problems (glare, lights, hearing), distractions, etc.
Even in this kind of conversation, you can add some conflict, even if it is minor: Colin is putting on his politician's face while hiding pain from stitches, and is wishing that this nice guy Electron would leave already, so he could stop making the effort. Or so he could call again for the damn water he asked for thirty minutes ago, or so he doesn't miss the entire first half of the football game.
