There will certainly be players to question your mental state for picking ghost.
Shake them off with a casual "thank me later" (and make sure to mute them when the game doesn't proceed in your favor).

Obviously there are disadvantages of ghost:
- it makes your movements more predictable (than with an unexpected and radical flash)

- it is trickier to escape sometimes

... but also some advantages:
- you will be ganked top because of your lower escape potential (some might see that as a disadvantage, but c'mon you will learn to love the classic 1v2 croco fights where you end up killing one or both of them. And if it's too hot for you: Meh, you still have the double dash on your e).
Solid tactic: talk to your jungler to countergank at lvl 3. Push lane to bait the opponent's jungler top (you picking ghost will not remain unnoticed). Win 2v2. Make sure to disrepect the enemy team by asking "Do you even ghost?".

- Ghost cooldown is lower than flash cooldown. Outghost them! Use your ghost to force the opponents flash and back off. Once your ghost is back from cooldown the opponents's flash is not! F*ck him right in the... um, kill him!
- Even if you both have your summoners up. You will catch up with your opponent over long distances.

- In Teamfights: Why stop after killing only one opponent? After you have used flash you get easily kited usually. With ghost you still have high chase potential after you have killed your first opponent.


Sneaky advice: Ghost has a channel time of two seconds. But you can cast it while you are stunned. Makes sense in some situations.

... and most importantly: Be tilt-proof!!!