This extension lets you auto-pin Chrome tabs to particular positions, based on URL [1].
This means you can make your Gmail & Slack tabs always show up in same position, so you can always use CMD+1 to switch to Slack, etc.
[1] https://chrome.google.com/webstore/detail/pin-tab/dgldedkigbbalaioohedddpameekglma?hl=en
Acorn for Mac is a solid cheap alternative to Photoshop:
https://flyingmeat.com/acorn/
Has similar controls and shortcuts so I’ve found switching over pretty easy.
<!-- #web/useful -->
<!-- {BearID:93C58A25-E33D-40A8-A32D-16C1EE879D02-89894-0004D183B14641D7} -->