Well, I survived and didn't starve. Didn't even need to resort to junk food. The food court at ION Orchard was open with almost all vendors working. It was absolutely packed on CNY days 1 & 2, though the restaurants off it were quieter and we had no problem getting a seat in one of those.
To be honest, I ate better on this trip than I did on my last one. Last time I followed recommendations to stalls in various hawker centres and ate food that was mediocre at best. I guess that some of these places, once they get recommended, let standards slip.
On CNY day 3 went to the food court at Takashimaya. Almost all vendors working. And a good selection of quality food. (Better than ION in my opinion.)
For high end restaurants, reservations proved impossible, except for very inconvenient times; I don't want lunch at 3 p.m. or dinner at 6.
No problem getting taxis.
As for tourist attractions, I've visited most of them over the years, but Gardens By The Bay was a new one for me. Very short queue to get tickets. Not so busy inside. Loved the Flower Garden, but not so taken by the Cloud Forest (but then I'm not a fan of heights, and no way would I do the high level walks). Got an S$8 discount on each ticket by presenting Tigerair boarding pass stubs, which was nice. (Yes, I'm a cheapskate when it comes to airline fares.)
My only regret was arriving on CNY day 1, by which time all the major festivities had ended; really nothing to see in Chinatown, apart from some tacky stalls and a couple of over-priced, touristy restaurants. I think it would have been much better to arrive a day or two earlier. That said, I did see a lion dance inside one of the department stores. Just a pity that I was desperately trying to get to a toilet on the far side at the time. (Dodgy prawns in the airline lounge in Bangkok on my way out, I suspect.)
All in all, a good trip. And I'll be back.