I guess I can't comment on ice fishing. Never did have much luck on DL in the winter months back when I lived a lot closer. Pike, sure. But the walleyes and perch were ghosts.
The past three summers we've had an annual Graham's Island camping/fishing trip in July. Sometimes it takes a bit of looking, but never had a problem bringing home plenty of fish for the frying pan and freezer.
But I guess your post was more regarding ice fishing perch. I remember watching the Perch Patrol commercials back in the 90s. You could take a train from the Twin Cities right to DL! Seemed neat to a young kid who woke up extra early Saturdays to catch the outdoor shows on the local channels.
I think the biggest joke about perch fishing nowadays is there are probably dozens of smaller lakes within an hour of DL with bigger and easier to find perch, but everyone just drives past them.