The first time I got into building pedals was back in 2004/5. I was buying boards from Tonepad and they are etched with the trace on one side of the board. I feel like on those boards it was much easier to get cold joints or accidentally bridge two pads. The boards like PPCB makes are much easier to work with in my experience. With my bad eyesight I sometimes I wish the pads were a little bigger or not so tight but I never have a problem. They can also withstand a reasonable amount of desoldering and part removal when required.I think for me I'm a bit paranoid about cold solder joints. There was a point (maybe 40 pedals ago hahaha) that I was reflowing every joint on the board by default just to ensure no cold joints. And this was because of a pedal I built early on that didn't work, then after reflowing all the joints it worked. Never did track down which joint the problem was. I've gotten a lot better at doing a good solder joint to begin with and have a lot more confidence in my inspection capabilities and knowing what I'm looking for, but I still like to see a little flow through, then I KNOW it's got a solid molecular bond to the pad.
Sometimes I might reflow some joints if they "look ugly" but I almost never attack the front side. It takes a lot of patience for me to try and not make things "perfect" and I find that when I start second guessing my work I end up actually creating a problem! I have no idea if my soldering technique is good but I've built so many pedals at this point I need to trust myself.