As for me, after a few years of working in a huge project inside a big team, I became concerned about accidentally breaking the project.
That’s why every time I commit something, I double-check my changes.
In the forthcoming IntelliJ IDEA 11 EAP, I have a special “digest” changes presentation for that!
NB: to see the digest of changes in Changes | Local, use the new “Change Details” toolbar button.
To tell the truth, even when I was in the middle of this “digest” changes feature, I simply couldn’t live without it, so I compiled a build of IntelliJ IDEA for myself and used digest view while developing the digest view!