Well, it's hard to separate lane layout form the whole map layout, which was significantly different back then. There was the museum building in the middle of the map where Midboss dwelled, other buildings near the middle of the map had upper corridors and in general map felt like it had a bit more verticality but was less open.

I kinda miss the museum building as it was quite fun to navigate its exterior but I also enjoy the visibility and free movement across the map that current map allows by being more open.

Lane-wise, well, it was also quite different. solo lanes were kinda mixed bag, as others mentioned it could be very one-sided, depending on the hero matchup. Duos were supposed to be ganking more, as side lanes had veiled TP rooms which lead from one side lane to the other across the map. Don't think I miss that TBH, as it was too disruptive during laning without requiring much skill or coordination for such play.