One issue I encountered was difficulty in communicating with store clerks.  This was particularly an issue with kiosk vendors, and other vendors selling finger foods, desserts, etc.  I like to make personal communication with them, and the language made that difficult.
I didn't talk to them.  I always had someone with me to translate.
I talk to them all the time, we smile, laugh, talk about general things the weather, life, food, etc.
I started learning the Greek language.
I appreciate intercommunication more.  I feel more confident when I encounter a vendor on my own, without the need for a translator.
When I get home, I'm hoping I will continue to be more confident communicating with strangers particularly, those who do not speak my language.