Leaving somewhere can clarify what you actually loved about it.

Distance sorts the real from the assumed. You leave expecting to miss the famous things and find yourself missing a bakery, a bus route, a particular quality of evening. The absence acts as a filter, and what survives it is what actually mattered to you.

If you are considering going, notice what you imagine missing and check it later against what you truly miss. Either way you learn something worth knowing, and it will make your next choice of place far better informed.