Michael, is that quite new? Last time I had a Gold Card (2010) I went to an Underground station to get Mum's Senior Railcard put on her Oyster and asked if there was an equivalent for my Gold Card and was told no. It's good to hear that they've managed to get it fixed although if your Gold Card is on your Oyster, you'd think they could set it to automatically do the discount rather than you having to request it.
I've started cycling to/from work and only take public transport if I know I'm going out after work or if it's truly atrocious weather. I reckon I saved myself £800 last year - more than the bike and appropriate cold weather gear cost me.