Never liked the TNG era warp cores. The blinking neon lights made it look more like a Dairy Queen than an Engine Room.
The one in the refit enterprise was better because it looked like something was actually swirling inside. I don't know why they couldn't just duplicate that for TNG.
"What's with all this churning and bubbling? You call this Radar?"
"No sir, we call it... 'Mr. Coffee.' Care for some?"