We took the Princess organised half day tour of Ephesus inc. house of Virgin Mary etc. back in 2001. We had a brilliant tour guide and whilst I'm glad I went, I have to admit I preferred Pompeii. In our case it was August, it was 'extremely' hot and everyone was wilting by the end of it. At the end we were dropped off by the shops (a short walk from the ship) in Kusadası and most of us (as you suggest) just wanted to get back to the ship.
Curious... why is the Grand Bazaar a "No No"? When we went before it was shut and I was planning a visit this time round, so would welcome any input.