@brian.strandberg
I never got chance to work civil 3d 2018 but used 2017, 2019 & 2020. What i have seen in 2020 is wrote here,
1. In previous version of civil 3d Shortcut Icons and Main File on civil 3d window icon was shown as " A " but in civil 3d 2020 its showing as " C " which is really nice to see.
2. In C3D 2020 whole work space color and icons are highlighted and looks nice compare to previous versions.
3. In C3D 2020 most of the icons preview images are changed in appearance and looks nice with background color.
4. In C3D 2020 & 19 we can see all transparent commands under on tab(transparent) on ribbon.
5. In C3D 2020 Under collaborate tab on ribbon special options are available which makes designers life easy to compare a drawings each other i personally felt this feature is very useful.
6. In C3D 2020 & 19 on ribbon Rail Tab is useful to make railway network projects and designs more smooth.
7. In C3D 2020 another option Parcel_CCW available for Parcel report generation.
8. In C3D 2020 Special feature available for structures installation under Network Layout Tools.
9. In C3D 2020 Special feature available for adding objects on profile crossings.
You can find more and important updates about C3D 2020 here,
https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2020/ENU/Civi...
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Cheers,
Neil
Project Manager | Civil | ACE Inc.
Certified Civil 3d Professional | YouTube | My-Blog