If you go to Kerinci "in season", you will almost certainly have at least one of the major tour companies in situ, plus any independent birders or photographers (most of whom hire Dwi to organise and guide), plus local trekkers (it's now quite popular with Indonesian Peak baggers). It's nothing like Gunung Gede levels of insanity, but it can be annoying since you are all sharing the same trail.
The walk-in hasn't changed much, other than the forest edge retreating uphill. Most birders pay for an ojek up through the tea plantation to save an hour's pre-dawn slog.
Otherwise, not so many obvious changes apart from most birds being trapped-out and almost nothing being tape-responsive! Dwi's hides are in fact a godsend under the circumstances, and with a bit of luck you can get fantastic views of the peacock-pheasant and Red-billed Partridge as well as the Pitta.
The fashionable place in Sumatra these days is Gunung Leuser in Aceh, which is once again accessible and has a huge amount of good forest left, and hasn't been trapped or taped-out... yet. It's a fantastic island for birds, but I think it's some of the toughest birding there is.