Hi Daniel,
we have spent a reasonable amount in Turkey, in fact we left Turkey late March last year after having stayed for 1 year cruising the country.
(Previous to that we had stayed 3 months in 2020)

yes, things have changed throughout these years, mostly on the financial aspect of things. Inflation has been a problem for a while and prices have changed considerably however still more competitive than in Europe. Exception goes to marinas that are quite expensive even when compared to Europe but usually the service is also better. Provisioning is still very cheap and with amazing quality when it comes to fresh produce. Turkey in general is extremely friendly to tourist specially from Bodrum area to Kekova where yachting and associated services is a good source of the income for the towns etc.

unfortunately since Covid they have imposed the use of agents to check in and out pretty much everywhere and is now near impossible not to use them. Prices vary greatly from port to port.
I recommend Marmaris for arrival as they are very friendly there and used to deal with all sorts of situations, but most ports are equally friendly.
I have a small blog hobby where I write our experiences, mostly related with formalities it might interest you, I’ll leave you a link here for the one regarding Marmaris and the check in process there as it has details of where the Q dock is etc

absolutely loved Turkey 
https://www.svthedream.com/post/turkey-marmaris-checking-in-and-out