There should be a separate Gold line at check-in - IIRC it is closer to the front entrance and next to the doorway to the Chairman's Lounge. Don't know if it is just one Gold/Platinum line or separate from Platinum line.
Chairman's Lounge is not a tier benefit - it is for those who have booked Penthouse+ suites and certain non-RFB comps. I believe I've read on here that certain FHR bookings also get access.
AFAIK, BFGA passes are a Plat+ benefit (recently moved to the "Platinum Experience" benefit). There is some discussion in the mlife thread on this forum, but I'm pretty sure Golds don't get this.