Great feedback so far. Thanks everyone. Those other links @JDRoberts added were v enlightening too, especially the use of Modes.
In terms of lights I’m already down the smart light route and have philips hue motion sensors in most rooms that turn on / off given time of day and available sunlight. This negates the need for a lot of the “turn on lights at sunrise” type rules people seem to use. And the Nest thermostat turns itself on/off based on what it’s learn so I don’t need things around that.
Haven’t checked if the hue motion sensors work with ST. Great if they do as the options in the Hue app are limiting. Guests still hit the old switches instead of the Hue dimmers right next to them but that’s a battle for another day.
I’ll def set up a bunch of Alexa commands to control TV, Apple TV, Fire Stick etc via the Harmony Hub. Doing this via Yonomi app at the moment but it doesn’t always work - or maybe Alexa doesn’t understand me. Great if ST can be an improvement here. In fact, anything that doesn’t run on a set schedule I want to be able to do via Alexa.
Some of the inbound/outbound/motion related ones @Old_school mentions are def worth adopting. Likewise I haven’t got any Sonos announcements yet. Useful.
Haven’t really explored vacation related options yet. Reading this I can see using a smart plug to turn on/off my Fake TV would be one thing to do, as well as some light schedules and motion alerts.
Really appreciate all the help!