We write so much obtuse code with no documentation, adhering to no standards, and with no tutorials that you can literally get side tracked for days on some esoteric dependency that has you bashing your head against the wall. (getting mcrypt working with php I'm looking at you)
You should keep other developers in mind when writing software.
I think that where tools can help is by making a wider variety of different projects more predictable because domain experts create easy to use tools that abstract away alot of the friction for us.
One notable example is jQuery: it has allowed a huge variety of non-javascript experts to very reliably produce work that, in the old days, would have been wildly unpredictable due to skull crushing differences in browser behaviour and the intricacies of JavaScript as a language.