Mackie's Traktion had a reputation for being the simplest and most-intuitive during it's (short) time many years ago. I wonder if it'd run and be useful on "modern" systems...
OK, just did some research. Best option offered right now IMHO is T7 - free, simple, and powerful.
https://www.tracktion.com/products/t7-daw
The blurb:
Like all Tracktion DAW applications, T7 features an intuitive, single-screen interface. Input, waveform and mixer – including EQ, level, pan and plugins – are laid out from left-to-right. Simply drag-and-drop additional features and automation on any track as needed. Unlimited numbers of audio and MIDI tracks, combined with a professional feature set, allow you to compose, record, edit, mix and share your music with ease. Modest CPU requirements make T7 ideal for use on nearly any Mac, Windows or Linux computer