My first "real" road bike had a triple. I found that while I made my legs happy, that by July I wasn't using the granny anymore. So when I upgraded to carbon I went for a standard double. Sure, if I don't do enough hills in the winter I really pay for it this time of year but that goes away soon enough. I also see this while riding with people who have triples, it's super easy to pull away from them on a climb just due to gearing. A couple of years ago I lost 2 bolts on my granny of my hardtail. We got it working again but I choose not to use it as I didn't want to lose the last two. This was end of season, and I spent the rest of the season, winter and last spring using the middle and big rings in the woods much to the chagrin of my friend whose backend I kept riding up. I kept telling myself if I trained like that, the hills at my race would not feel so hard at all! But then I fixed the bike when I had to sweep a running race so I wouldn't run people over, and when you've got that granny it's oh so easy to drop down into it. At least once I get on the road bike I have no choice!
I found that when I used my granny, I was pretty much spinning away like a gerbil and going nowhere.
I do agree what what was said before to stay seated. Out of saddle climbs should really be done in in short burst. IMO only.
Food..... that's a huge subject! I love that you also enjoy peanut butter and crackers!

I used to buy Ritz Bits but in the last few years I've taken to just getting the big regular Ritz and a jar of peanut butter and making them myself. That way if I just want one or the other, it's there. I also have a recipie (which I modified) for a sort of oatmeal/craisen cookie (got it out of Bicycling Magazine a few years ago). Since I do endurance events I find what works for me is not really what works for a lot of people. I spend so much time at an aerobic HR that I can almost eat whatever I want (except for too much sugar, though I did eat M&Ms and Mike & Ikes on a 16 mile trail running race - I was amazed my body told me to grab them!). Pretzel bites are another easy to carry favorite.
Clif makes Roks protein bites that I really love too, but they are REALLY hard! Some times I feel like I'm going to break a tooth on them. For gels and drinks I use Hammer products. But it's really all trial and error. It's taken me quite a few years and many hours to figure this out and I know things may still change with time.
My favorite post-race food: hamburgers! I get an incredible craving 45-60 mins after a race. After my big race I even splurge on cheese
Every time I am tempted to sing I remind myself I am going to be super embarrassed if someone hears me. But you will see me "dancing" on my bike on the trails when alone.
I really have to get out tomorrow!!!