A good questionnaire replaces an entire first session of fact-finding with fifteen minutes a client fills in on their own time, before you have even spoken to them.
Here is why it is worth building one properly, and what tends to make the difference between a questionnaire that gets used and one that gets ignored.
A thoughtful set of questions signals that you take the relationship seriously from the very first interaction, before you have said a single word to them directly.
Goals, history, and logistics are three different categories, and mixing them together makes a form feel longer and more confusing than it needs to. Group related questions so it reads as a conversation, not an interrogation.
Referencing a specific answer from the questionnaire in your first real conversation shows a client you actually read it. Skipping that step wastes most of the value the form was supposed to create in the first place.