The Big Bang is a two parter beginning with The Pandorica Opens, the other two were one "hour" single part stories, and always felt rushed in terms of pacing.
I just think we'll get better finales if they were split into two episodes instead of just one.
I thought you were commenting on one-hour finales being too long, or something like that.
I do like two-part finales for the most part. I'd like to see Moffat try a 3-part finale, like RTD did with series 3, but with a better conclusion. I liked both Utopia and The Sound of Drums, but Last of the Time Lords was disappointing.