I read a few posts, but to be honest I've not really bothered to find out what fellow members think of First Class. I notice some people mention going FC if the fare's reasonable/there's a cheap Advance in it. These days that's almost the only way to do it, apart from Weekend First. Which never used to be do-able on a rover/ranger, I see they've changed that on FGW now.
If I can get a decent First Class deal, I'll definitely go for it. Depending on the TOC's offerings regarding complimentary items, it can be worthwhile. A good example of a TOC NOT offering much value to First Class passengers is NXEA, nothing complimentary to their FC passengers! That put me off paying the extra when I last used NXEA in September 2010 (wow, just realised that's ages ago!). I was happy enough with the comfort and relatively ease of finding plenty of space on the loco-hauled runs I was on anyway in Standard Class.
My favourite First Class trips are all way back in 2004 and 2005, when I would use complimentary Weekend First vouchers regulars, thanks to the FGW loyalty club that was running at the time (I forget the name of it at the moment, anyone remember it?), always looked forward to the vouchers coming in the mail! If it wasn't complimentary Weekend First, I would go First Class during the week fairly regularly (absolute minimum once a week) using the 1130 Swansea to Paddington HST, as it had the awesome Pullman dining service on it.
Even if I was alighting at Newport, I would often use it, indeed the one time I remember using it to Newport on the way to Hereford I rushed a delicious apple pie and custard just to take advantage of the service. Mixed grill was my regular meal, and I can't believe I've forgotten the name of it, but I used to always have a small bottle of Australian dry red wine with my meal. Overland I think it was, not sure if FGW still serve it on-board. Next time I get a chance, I'll have a look and get some. Absolutely loved it and it was an exclusive to FGW wine too, not buy-able in the shops, from what the crew told me once.
Mind you, one time I used it on my way to London for some sort of bash, no idea when or what I was going there for. This time, I got the large bottle of my favourite tipple. After the 3 hour or so journey to London, and in 2004/2005 I was making that journey 2 or 3 times every quarter just for the sheer hell of it, I was fairly tipsy! I was glad to alight at Paddington's platform 1 for some fresh air, that's for sure. After that, I felt perfectly sober all day randomly.
Anyway, as much as I'm loving this trip down Memory Lane, I'll be here all day at this rate. So to finish this off quickly, I must disagree with the OP, as I enjoy my First Class journeys when I can make them. Personal space and all that is great, but I think that when you only use it as a treat it's so much more special. These days I don't bother using it on FGW as I don't enjoy the leather seats they've got. Tried it once long distance last year, nothing like the same as it was when I used to use First Class regularly.
Final thought is that I loved walking straight past Standard Class carriages when I used to board the 1130 at Swansea and board one of the front carriages in First Class. It gives you that feeling of smugness you just can't get going Standard Class. So yeah, when I can afford it I will always go First Class!