From somebody that does all the content:
Imo encounters are fun and diverse in playstyle. Raiding itself does not feel rewarding though. You see people running around with mythic ilvl because they got titanforged LFR / normal items. Back in BC / Wotlk you had BiS gear because you did the hardest content. Now you can be lucky and get BiS gear before people even kill the last boss of the expansion. Due to the nature of titanforging and artifact power you are never finished with a toon. So if you plan on hardcore raiding it will fucking drain you. I enjoy quality raiding over quantity. 2-3 raids a week.
Mythic+ seems to be the focus of the blizzard esport team. It combines the theorycrafting of raiding with skillsets that you normally need in PvP. CC, Interrupts, Awarness etc. Imho the best competitive gameplay currently in WoW. If you enjoyed running harder 5mans in BC this will totally be your thing.
PvE: Questing etc.
Leveling and suramar questing was a rather positive experience. Suramar in general felt like doing those long as attunements quests in older expansions. It is not as monotone and it is rather focused on storytelling.
This bracket is not enjoyable at all. On the very high level you have very few teams that like to dodge or snipe if you play with a subpar lineup. So games often times are onesided. Activity is also quite low so you often times end up being matched with way lower / higher teams. RBG gameplay is really fun if you end up playing against a fairly matched team but this happens very rarely.
Going for Glad on EU means playing against blizzcon and multiple R1 alts every single game. 200+ R1 spots go to 50+ different players. Balancing is normally just a dps / hps tweak and real issues with gameplay are rarely touched. We lost the foundation of casuals that feed rating and increase the cutoffs (competitive pyramid). Old players keep playing and casuals stop playing without being replaced by new players (inverse pyramid). So getting glad+ titles is way more competitive. Still no soloqueue and finding a team on higher level is nearly impossible. You should be fine if you have old mates that still play though.
PS: you can dupe glad mounts now