As the subject says, I need to create 1,000's of items and quick edit is just not going to cut it. Is there a way for me to add say 10,000 items from an excel file without getting throttled?
You could create a Flow that loops until a counter you set and increment hits a maximum value. Please note that, by default a Do Until loop will on loop 60 times and run for a maximum of one hour. You can change those defaults by clicking on Change limits and setting the count and timeout as appropriate.
Even when you change the limits, a Do Until loop will run for a maximum of 5000 times. I don't believe that this is increased if you have a premium license, but I'm not sure. This means that to create 10000 list items, you'll need two loops.
Inside of the loop, you could get one row at a time from Excel and use a create item action. Alternatively, you could use a Get Rows action and loop through all items returned up to 5000 times.