There is still a huge gap. Waiting, waiting, waiting. Perhaps there can be an achievement of how long you'v waited between buying upgrades? Something like "Paint Drying" achievement that doubles profits or something. "The Grass Is Always Greener On the Other Side ... Especially When You've Watched It Grow For Three Days" achievement.
Get to quattuorquinquagintillio and everything sloooooooooooooooows down ... It's like a fun stopping barricade. It's like skateboarding at city hall and then they put those stupid knobs on the benches. It's like skydiving only to realize it was a bungee cord. It's like playing Great Balls of Fire on the piano only to realize that it was programmed into the keyboard. I miss progress.