That one overnight stay at Big Box, I was going through the shops and peeping at the back roads, no bus in sight.
Gelang Patah mostly shophouses there, and between those across from Petron leading up to the terminal, some schools. Shophouses again outside the terminal. Don't think will be of interest to you, unless you want to grab a ride. I've only gone to makan across Petron side, but never walked out once I got into the terminal.
But the one thing can Grab to from there, is Tong Gardens that's an open house leading up to festive seasons like CNY, Hari Raya, Diwali. Prices would be good for those loading up lorries.