I sketch my scores by hand on Judy Green score pads with a custom layout (36-stave). If I'm REALLY in the crunch and it has to be a mock-up, then I may go directly into Performer, using the pad just for basic orchestration "blocks."
I've owned Finale since 1.0; rarely use it. My orchestrators - who really act more like proofreaders - bring stuff into their program of choice for that stuff.
Speed-wise, I knew very young that was going to be important. It's a skill like any other. Between projects, I constantly do speed exercises, where I have a given number of hours to produce a given number of minutes of music, and I treat it like it's a real job. I must finish, and it must be as good as possible. 25 years of doing this all the time has helped me learn to get to "it," quickly, but I still have to practice constantly, to avoid falling back on the same harmonic habits piece after piece. Also, when I do my sketches, I do them in pen, so I'm not allowed to correct or erase - this forces my internal musical ear to be sure about its choices, because I only get one chance. I always make mistakes - there are mistakes in the Star Trek piece, for sure - but my feeling is that if I can get it 90% right the first time, quickly, then on a real schedule, I will have ample time to review and get things the way I really want. It usually works out that way. In fact, if I take too much time writing, I begin to hate my own work and it kills the momentum. As it is, I have learned to let go of a finished piece very quickly, because within an hour, I despise almost everything I write, and will change or destroy it otherwise.
Also for speed, one other thing I learned to do was go for 3 or more days without sleep and little food. I began training for that in 1990, and for the last 15 years, I regularly only sleep 4-5 nights a week, tops. This has saved my ass on more than a few occasions, where I was asked to do something that wouldn't have been possible otherwise, and a great many jobs where I'm called in at the 11th hour to rescue a project, and without being able to go constantly for days, it would be logistically impossible to finish. It also allows me - when things are working - to just stay with it as long as possible, but I also steal the trick of stopping while I still have an idea, so I can begin with that fresh the next cycle. I think of the score to Gone With the Wind - which was 3 hours of orchestral music written in 4 weeks. Amazing... unfair and ridiculous, but this business often is. I got a couple of early breaks just becuase I could finish when other guys couldn't. It cost me a marriage and gave me kidney stones until I figured out how to adjust my diet, but my work is more important to me than those things. On non-project cycles, I use the extra hours to train, both musically and physically. I have to be at the gym every day and stay in shape or my body can't handle the stress. As it is, when I sleep, I sleep like a baby :)
I have a ton of other things which I do regularly as part of the discipline, but they're not directly related to speed. If you don't have to cultivate this skill, why do so? Enjoy the time writing, and let it flow how it flows! If you want to learn to get faster, just start setting time limits for yourself - say, 2 minutes a week, and force yourself to hit it. One thing I did, in the beginning, was make myself perform my speed pieces for others, so that I could feel the humiliation of an incomplete work. You'd be surprised how effective negative reinforcement can be! :) Anyway, those are a couple ideas for you.
Best,
_Mike