Greetings,
There is (for me) a small speed bump in psql. I think it's worth mentioning, minor though it is, because psql is such a polished tool generally, and because it's something which affects me many, many times a day.
As it is, \d is a shortcut for \dtmvs. What I actually want to see, on a regular basis, are my relations: \dtmv. Most of the time, the sequences are clutter. If my habits are like most people's in this (and I suspect they are), excluding sequences from \d would optimize for the common case.
Just $0.02, submitted for your gracious consideration.