I have watched everything by Ghibli.
I have watched 5 cm per second, Jin roh, Summer wars, the girl who leapt through time, The place promised in our childhood days.
I would really appreciate if you could suggest something interesting to watch! I prefer movie animes, I am not big fan of endless series of animes, so if it is several episodes I dont mind! I really like sentimental stuff, something similar to 5 cm per second or girl who leapt through time! I really enjoyed summer wars as well! Ghibli stuff, I like everything, maybe except tales of the earthsea!
Since you've watch 5cm Per Second and The Place Promise in Our Early Days, you should also see Voices of a Distant Star.
And as you like The Girl Who Leapt Through Time, I'd recommend the Haruhi Suzumiya series and film, as they similarly combine slice-of-life with science fiction. I know you said you don't really want to watch series, but with Haruhi I think it's best if you've seen the series before the film. And it's definitely worth it!