I think a lot of people have ditched GN at weekends. I know a fair few myself who have. Personally I can't remember the last time I took a GN train on a weekend. Nonetheless I can imagine the 387s are pretty hellish inwards from Welwyn -- and there's a lot more of this to come from February when the majority of the weekend stopping services will be formed of 1x387.
I had to use GTR when I got back from Paris (an hour late due to a delayed TGV) and was surprised to see that our train was running! I did wonder if, as has happened previous, January is proving to be better for staffing now drivers perhaps want to earn some extra money to pay for Christmas?
Other than this one trip, I also avoid weekends. I'll use Thameslink from St Albans, or drive to Cheshunt and travel from there (engineering work dependent).