Thanks everyone who has commented.
I downloaded SuperSlicer and will have a play. It was quite a shock having only used Cura since I first got my CR-10 several years ago. I get that it will be a learning curve with changing to any new slicer. I too have been frustrated at times to find that version changes to Cura have changed the way things work.
I agree with Tim's thoughts on the difference between commercial and open source software, and whilst I don't print all the time, there are certain times where I need to print a lot in a short timeframe.
Out of interest, I sent an email to S3D asking if S3D was still being maintained and here is their response:
On August 31, 2021, 3:22 AM EDT firstname.lastname@example.org wrote:
Thank you for your email. We are all still here in the office working away on the new version. We are really, really excited for V5. It will be a massive update and has required a lot of work here at Simplify3D but we are working to bring it to you as soon as we can. Please let me know if I can be of any further assistance.