1. Do you know of anyone who has had a close call with a drone whilst flying a helicopter? No.
2. Have you ever had a near miss with a drone? No.
3. Have you ever collided with a drone? No.
4. Have you ever seen a drone whilst flying a helicopter. Yes.
5. Have you ever had a near miss with a bird? Yes.
6. Have you ever had a bird-strike anywhere on a helicopter, even if just a blade etc? Yes.
As for drones, from a helicopter during the day, they are almost invisible. You often wont see them until its too late. Ive had operations where ground crew have alerted us to drones present and even with all the crew searching, its taken significant time to spot the drone - especially looking down upon them with a complex background behind them.
Ultimately, no drone operator wants their drone near a helicopter. But are you willing to bet everything on what some unknown person is going to do?