I really like E/R Studio for modeling work. It is expensive, but I've not found a nicer tool to do it across multiple database platforms.
Their website shows they don't officially support the latest versions of PostgreSQL. It does work, but the menus haven't been updated for all the latest features. If you want to use syntax from a newer release, you'll need to do a SQL override until they update the tool.
Their team version keeps the metadata in a database, instead of a file. The locking/unlocking of individual tables is cumbersome. The metadata database doesn't support using PostgreSQL for storing the metadata. I tend to store the models in Git and use the built in model diff tool to do model merges.
ER Studio gets slow when you are north of 10k tables/views in a single model. As a work around, I use sub-models and do not touch the large master model. On a large main model, their visualization tool I believe tries to render all 10k tables. It starts taking 1-2 seconds between clicks. Smaller sub-models (1-2k) off that large main model do not have that issue.
The scripting extension for ER Studio is decent, not great, but significantly improved in the last few versions. It is close to being VBScript. Scripting makes updating really large models a breeze. I use it a lot for storage/index parameter parameter changes during hardware/software upgrades.