English works in some parts of Turkey well enough for travelers to feel comfortable quickly. That does not mean the whole trip stays easy in English only.
The difference is usually not dramatic. It shows up in small moments: confirming details, sorting transport, asking the right follow-up question, and understanding tone.
The practical takeaway
You do not need to overreact and treat Turkey like an impossible destination in English.
You also should not assume that “tourist area English” tells you everything you need to know.
One clear next step
Plan for the moments where the trip needs precision, not just basic survival. That is the right way to think about language prep almost everywhere.